Yeah, ive had hypochondria pretty bad before, worrying about having a serious illness was making me feel worse so it was like a vicious cycle. It kinda stopped after i realised that it was just me worrying about nothing. It was really horrible at the time though, my life was just consumed by it and it went on for months.
I always worry about stuff.. even if one thing is solved i will start worrying about the next thing, its never ending.