Years ago, I had a very irritating feeling in my feet whenever I went to bed, they felt warm and dry. It kept me up at night and many times I actually got up to get a cold, wet towel and wrap it around my feet. After months of this (coupled with insomnia, severe depression and very low energy) I was finally diagnosed with hashimoto's. Turns out I'd had it for years, but my TSH was withing range (very sidderent from being optimal) so it was overlooked.
Stop the thyroid madness is a good source of information on hypothyroidism, make sure to get your actually levels (TSH, FT3, FT4, preferably also aTPO) and don't just listen to your doctor when they say "Your levels are fine". Mine were "fine" and I had all the symptoms of hypothyroidism, and lived a miserable life until my levels finally got bad enough to become out of my lab's range. 95% of healthy people have a TSH below 2,5 and yet labs still say you're fine if you're at 4.
I feel absolutely awful with a TSH anywhere close to 2,5 even. I need to be at 1 or around it.
Recently, night after night I found myself lying awake at night, unable to fall asleep and thinking of putting cold cream on my feet because they felt so warm I couldn't stand it... turns out it was a Hashimoto flare, and my TSH got above 5 again. I increased my hormone dose and the problem went away.