I started on Levoxyl about 3 months ago. I noticed my hot flashes (I'm menopausal) get worse, then I started getting horrible irritable bowel, nervousness, tingling, headaches, and mood lability. I have been off it a week. The symptoms are a little better but still persist. Anyone know how long these might last? I will not use it again, for sure. If anything, I will use Armour Thyroid or something more natural. Any suggestions.