Is the bleeding cyclical? Rarely if the stump of the ovary is left there is enough to continue pumping out a small amount of hormone.
Brain fog is common as hormones rise and fall. As oestrogen levels drop off the body may become dry: inside and out; deep in the ears, nostrils, eyes, vagina, skin - as well as muscles may become lax - aches and pains.
You have been through major surgery which may well leave you feeling low, also the reasons why drastic surgical intervention was required. If U want to share, please do, also let us know how old you are.
Some find that keeping a mood/food/symptom diary of use to chart progress.