Levoxyl and tiredness

I have being taking thyroid medicine since 1994. I was diagnosed with Hyperthyroidism and prescribed Synthroid. It didn't work. Instruct to take radioactive pill. Now, diagnoses change to Hypothyroidism. Prescribe Levoxyl. Endocrinologist said I would lose weight, but instead I have gone from a size 8 to 16. I feel really bad when I miss my doses. Really anxious when I take it every day. I am noticing that I have moles growing out and spreading all over my body. Switch back to Synthroid three months ago. That when start experiencing a great deal of hair loss. Decide to switch back to Levoxyl but a lower dose. The hair loss has slowed down a little. But, hair is growing slowly. I am having problems focusing and some memory loss. I really don't know what to do. I have change endocrinologist twice. I really think that Levoxyl and Synthroid have bad side effects on human after long term usage. I am miserable because I can't control my weight. I know that it has something to do with this medicine. If anyone know of some other medicine that would Hypothyroidism in check without all of the side effects that I mention. Please share it with me.

I have been on Levoxyl for 6 months now and I hate it. My eyes burn and itch. I feel tired all the time. Also sleep a lot. The tiredness hits me all of a sudden like someone flipping a switch on. I have never felt so bad in my life. I'm 50 years old and the doc blames the way I feel on old age. He did not discuss any side effects at all. When I was on synthroid I felt a whole lot better. But he changed me to Levoxyl.