Was your baby 'natural' or hormonally assisted?
As oestrogen levels drop muscles may become lax = aches and pains. Do you take over the counter pain relief? Also the body may become dry: inside and out. Skin, deep in the ears, scalp, nostrils, vagina ........ HORMONES

Do you get out with the pram as regular brisk exercise helps the joints and lessens the chance of osteoporosis. Is she toddling?
I have aches and pains since I stopped exercising. I am my own worst enemy by not kneeling when doing up shoelaces etc.. My sciatic nerve soon complains. So making sure that when dressing and lifting your toddler, be in the correct position.
I had my last period in 2001 and fortunately haven't had too many aches and pains. I know what causes it so it's manageable. Vaginal atrophy however and we have threads about that: do read. Make notes

Mood swings can be hormonal or due to the body being hungry. Think of a baby who cries loudly when hungry? Maybe check your over all diet and see if you need slow release foods, i.e. bananas, porridge .........