I was put on Azathioprine in August after having a bad reaction to the Hydroxychloroquine i was originally prescribed. This morning (approx 3 months later) i woke up feeling dizzy and sick with a racing pulse. I'm worried i'm having another reaction to the drugs. The dizziness is fairly severe and has lasted all day. I can't bear the thought of having to start on a new drug all over again. I've already been off work for nearly 6 months. Anyone else had similar problems?