I bought a cooling mattress pad.
Alex
I am sorry for your suffering! Hopefully, your remaining ovary will "get with the program" soon!! If that does not happen soon, you could go on a birth control pill. They sort of "override" or "replace" ovarian hormones. So that can resolve the menopausal type symptoms (in your case night sweats) but I do not know if it will just prolong the situation or not.
If you are close to menopausal age, there is a greater chance that your other ovary may not make up for the one that was removed. In that case, you may want to go on hormone replacement if this problem continues much longer.