38yo f, partial hysterectomy 5 years ago. recent fevers, malaise, hot flashes, joint pain. all blood work neg except 35 and fsh 145.7. what's wrong?

Malaise, hot flashes: Please request a full workup of your thyroid, and not just the TSH. A full thyroid panel including antibodies to the thyroid, and Reverse T3 (liothyronine). You did not reveal the rest of the test you had done, but you should have all 3 estrogens checked, progesterone and other hormones. Request to see an endocrine md or a Functional Medicine doctor to help figure out what is happening with your hormones.