hi clare, your post sounds the same as what im going through. i was diagnosed with hyperthyroidism "graves" and had a option of tapazole or RAI, i tried the pill for a while which didnt seem to help me very much.well like yours mine resolved itself back to normal. it has been proven that depression/stress/anxiety can effect your thyroid.i know!! i felt fine for a month or so and had a stressful upset and that was 2 weeks ago, since then im back sick, fatigued, headaches ect...the "only thing" that has helped me in years is a hobby that of course i forced myself into which is metal detecting, for example i can hunt for hours with no luck, just plain fatigued and bored and then bam!!i find that silver coin and i am energized hyped ect..the mind is a powerful thing!!what im saying is get a new hobby that you may enjoy to lift the spirit and energy.im like you ive tried all sorts of remedys with no improvement, and the doctors are puzzled,kinda had to figure things out on my own.anyway welcome to the boards!! hope things improve!!