O.K. I an 14 and have Ankylosing spondylitis(big words). I have been taking Enbrel for the last 10 months, one a week. It started out painless but then suddenly, every week it would hurt- A LOT. Sometimes it takes 5 seconds others 15, sometimes I'm running to the bathroom with blood running down my leg and others I don't feel. More recently I had an extreme burning and my skin was raised and deep red, the worst was when air bubbles and medicine came spraying out.OW!!! Should I stop! What do I do!