Hi Was recently diagnosed with low thyroid and prescribed 50mg of thyroxine. The first two months were good I felt great hair getting better. Then I renewed my prescription and a different pharmacy gave me actavis. I am itching all over especially my head and I think I have a few hives. My heartburn had cleared up and now its back with a vengeance. My hair is like wurzel gummage. I think its the change in brand, I was on Teva. Any others experience this?