I worked full-time for 4 years (before I realised I was peri!)and it was a total nightmare. Now I am p/t while caring for my mother - if anything, it's more stressful & exhausting, but at least I can be more flexible now!
If at all possible, go part-time or at least see if you can adjust your hours to fit round your 'good times' - e.g. I used to start work between 7.30 and 8, I now start work at 10am as I find mornings are usually my worst times.
If this isn't possible, then try to cut down on work elsewhere. Lower your standards for cooking & housework (still eat healthy, just try to cook simple). If anyone else in the house isn't happy with this, tell them they are welcome to take over!

Make sure you aren't overloaded with voluntary things outside work, but at the same time, be careful not to cut everything out. At the start, I stopped anything non-essential as I was struggling so much to cope, but I've actually found I feel better if I have a treat to look forward to each week. So I ring-fence a couple of hours to do something enjoyable & found it helps me unwind and feel a lot better about the rest of the week.
If your boss is supportive, it might be worth asking if you can make some short-term changes to your job until things are sorted. E.g. if you are working with someone else, can you do more of the typing & behind-the-scenes work, while they deal with phone calls and patients coming in? I know it is not always possible to make these changes, but it is in their interests if possible as the healthier and happier you are, the better you will work! Hope you are able to get some help. Hugs x