I have Hypothyroidism. I have been taking levoxyl for at least 8 years and over the past year, I switched to a generic brand. Lately, I am feeling all the symptoms of an inactive thyroid, but my blood levels appear to be in the normal range. I am listless, weepy, my hair is falling out, my nails are brittle, my skin is dry, I can't lose weight, and I have short-term memory.