I have been hypothyroid for 8 years. I was taking generic levothy...

I have been hypothyroid for 8 years. I was taking generic levothyroxine SOD for years, and had no extreme problems. However, they switched me to levoxyl about 4 months ago and it has been bad ever since. Stomach problems, very tired, can't sleep well, hard to function, and woozy in my head all of the time. I quit taking it for a couple of days and I felt somewhat normal again. I do not know what is in levoxyl that is different, but I am going back on just generic levothyroxine SOD.