I started getting night sweats the week before my period at 39 (about 18 months ago). I also had migraines before and during my period. Because of my high FSH, I assumed these symptoms were caused by low estrogen and that I was moving into menopause. I had also gained 10 pounds, was tired all the time, had flaky skin, and felt foggy-brained. After a year of suffering, I finally saw a wonderful endocrinologist (not RE, just regular endocrinologist) and he diagnosed me with thyroiditis (enlarged thyroid). I was completely hypothyroid, despite the fact that my initial bloodtests performed by my naturopath showed my thyroid levels in the normal range. Turned out I needed more sensitive tests and antibody tests. Just wanted to put that out there because we high FSHers tend to assumed night sweats and hot flashes are estrogen-related, when in fact they can be thyroid-related. And most drs just assume that if your TSH levels are in the normal range, they don't need to do further tests. Makes me wonder if my thyroid levels were low when I was TTC 5 years ago. I think more of us should push for detailed thyroid tests.
Also wanted to mention that like you, my FSH tested high (14.3) when I had been taking Clomid for several months. I believe that in some people, Clomid can make FSH levels spike. My FSH was never tested before I was put on Clomid so I don't know this for sure - just a hunch. That may be the case for you. FSH was not an accurate predictor for me of my future IVF success - I went on to have two kids (one IVF, one nat. preg.).
Good luck to you,