I've had Anxiety for about 3 years now, I had it so bad that I couldn't even leave my house, that was 2 years! I finally got my life back on track, still had horrible anxiety but I just went through and tried as best as I could to go about my life like everyone else. Sometimes I start to feel ill, kind of like the flu or something but its not. I was wondering if Anxiety can cause you to feel ill even if you don't feel anxious? This feeling ill comes and goes so thats why I think its probably Anxiety. I also have an underactive thyroid, don't know if that has anything to do with this but thought I would mention it just incase.