U have a lot going on. STOP Googling! Keeping a mood/food/symptom diary is more use than reading 'what ifs'.
Stop the guilt, it won't get U anywhere. We are allowed to wallow occasionally, I am sure that at 6, this doesn't bother your child that much. Time for cuddles and a book or video?
Comfort food is OK in small amounts. It is however a quick fix in that the body expects more nourishment so feels hungrier much quickly. R U able to batch cook and freeze? Small amounts of cooked mince with veg., frozen - ready to defrost in the morning and add to rice or to make a soup? [says I, who has a Chef (DH)

].
Dried fruits/nuts; pancakes; bananas ....... as good for snacking and gets your daughter into good eating habits. Fish and chips, beans on toast, good protein filled meals.
Remind me what PMDD might be

MayB speaking to a dedicated menopause clinic will ease your worries about cancer. The risks are very low and there are several ways of using replacement. Remember that vaginal atrophy is different to overall menopause so requires different treatment which is low risk and keeps any symptoms 'down there' under control.
U sound as though you have a certain amount of mania to y our symptoms which may be caused by hormonal upheaval. Dr Dalton did a lot of research on pre-menstrual syndrome, it mayB worth your while reading the National Association for Pre-mesntrual Syndrome [NAPS] website - the advice from them saved my Life.
Thyroid upsets can cause some1 to feel continually cold, this needs investigation from your GP or Nurse Practitioner.