Levoxyl and weird sensation

I've been on levoxyl for approximately 10 years thinking the side effects were from my hysterectomy 6 years ago and being on hormone replacement therapy. I am irritable, agitated, unable to stay asleep, having more and more trouble recalling people I've met through work and retaining information. Family and friends have teased me. It's getting worse. My most bothersome side effect is that every night while after falling asleep, I've been awakened by extreme hot feelings like I'm on fire inside, not the same as hot flashes experienced by menopause. I'm hungry all the time feeling like I can't stop eating, luckily, not gaining much weight but picking on food as much as possible. I'm waiting for a phone call from my doctor to see how to stop using levoxyl and what I'll have to replace it with.