CS24, you sound like you're in such a desperate situation, but there will be light at the end of the tunnel. The insomnia on top of everything must just be too much right now, but I'm sure you're a great mum and your boys love you. This forum helped me get through my darkest moments, and hopefully it'll help you too.
My favourite website for recipe inspiration is this one:
https://lowhistamineeats.com/low-histamine-foods-list/The lady who runs it isn't a medical professional, but suffers herself and provides some really helpful info and links elsewhere. She has some great breakfast ideas (her 15 and 30 min 'overnight' oats are my go to at this time of year with so many apples and raspberries in the garden to add to it). Her low histamine waffles are great - even my husband is happy with them (topped with fruit and quark (instead of yoghurt)! She also has suggestions for making low histamine 'pizza' and similar substitutions.
I didn't use a dietician myself, but consider myself a good home cook and really kept an eye on nutrition (I've been vegetarian since a teenager, so have always read the labels on packaging). I've resorted to using a pea protein powder in smoothies to make sure I'm not missing out on that - some are more suitable for a low histamine diet, but there's info on line of you search. I've also started using a lot of bean and pea flours to make pancakes - this is one of my favourites
https://hodmedods.co.uk/blogs/recipes/pea-bean-dhebra (substituting the spinach with kale or chard). I was nervous about using a bean flour at first, but luckily I can tolerate it used fresh (tinned beans and pulses are still of the menu).
I've had a bad reaction to coffee since my 20s, so I only ever had one or two cups a year - giving it us was therefore easy for me. Chocolate was easier than I thought (when hubby is munching on it i'll have a couple of brazil nuts and a couple of organic, sulphite free, dates). Tomatoes was a biggie, but roasted peppers blitzed up with herbs and some nuts that you tolerate is a tolerable alternative. I've never liked bananas, so again an easy one for me to avoid, and although I love avocados I don't eat them often. However, I've managed a small amount of avocado when I was eating breakfast in a cafe (poached eggs on GF toast), and it was okay for a special treat.
I make my own sourdough rye bread and my favourite food was marmite on toast!!!! However, I've cut it back to once a week and I seem to tolerate it if everything else is low histamine (not with the marmite though!). Fresh cheese e.g. quark, curd cheese, ricotta, mozzarella is okay for me. Therefore instead of having a salad with walnuts and blue cheese I'll swap it up for hazelnuts and curd cheese, with a tiny bit of celery salt for a bit of zing. I can tolerate quark and creme fraiche instead of yoghurt.
If you keep a detailed diary of food and your symptoms hopefully you can identify the swaps that work for you. Last night I experimented with roasted peppers on baked polenta slices with ricotta and a bit of vegan pesto (from a jar). It was really delicious, but I think I'll use less pesto next time (or make it myself) as it wasn't great for my symptoms, but still tolerable. Roast veggies are great - I make my own fresh humous that's delicious with them (the shop stuff is no good). Thick hearty soups and stews are good this time of year (and quick in a pressure cooker, and even quicker if you use frozen veg to skip the prep) - I'm going to have a go at making some gluten free dumplings to go with them this week.
Tonight I'm thinking of something simple and comforting as it's a bit of a miserable day - a potato bake with onions and the remaining ricotta, served with some kale (with butter and carraway seeds).
For sleep I find following a yoga nidra really helpful (and easier than meditation) - there are lots online, or you could try the 'insight timer' app. The free mini course on this website has some sleep tips that might help
https://www.morganadamswellness.com/?cid=0ce43e9d-a9c0-4251-95c0-e79477761e3d. My sleep routine is about 2 hours long (although I don't have kids to look after) involving a warm bath, listening to relaxing music (radio 3's night tracks is amazing) whilst I spend 15 mins on duolingo to try to help my brain fog, followed by 30 mins on cross words / sudoko (for brain fog), reading something interesting (but not too gripping or exciting), followed by some breating exercises, a yoga nidra, and maybe a relaxing 'sleep story'. On bad nights I'd just do one yoga nidra after another for hours, and I did feel more rested than just tossing and turning, trying to sleep. I'm sure there are other tips on the forum that might help - maybe 'tapping' meditation for sleep (I find it magical for anxiety).
I really hope your symptoms improve soon. Thinking of you and sending kind wishes. You will get through it eventually (may nan always used to sing the Lena Martel song 'one day at a time' to herself when I was little, now I understand why!)