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Your BPPV is not related to ovarian cyst
can be due to low/high BP
which needs to be check up. The low BP can be due to many reasons which can be found out by Doctor's examination and investigations. Wear cool cotton clothes to prevent heating feeling of the body, take around 2 times bath a day to feel refreshed. Since your ovaries have been removed you are probably experiencing hot flushes which is due to premature menopause
due to lack of functioning ovaries. Not to worry. These symptoms will subside soon. If you are very uncomfortable, better visit Gynaecologist and get hormones checked. If you are having low menopause induced hormones you can get Hormone replacement therapy
which will prevent these attacks and give good relief. Also eat plenty of fresh fruits and green leafy vegetables, soya bean is rich in phyto-oestrogen which is needed for female hormone effect in body, will help you. Drink plenty of water. Exercise daily by brisk walking for 40 minutes a day.