I had it ystrdy and woke up shaking. I got up and put on a jumper and a dressing gown and took 2 nurofen although my hands were shaking so much it wasnt easy. Bashed the edge of my glass off my tooth. Ouch. No damage luckily, and i feel ok now although a bit achey. I never think im going to side effects. Anyway, if you are having the janssen vaccination take lots of nurofen and go to bed with yr coat on.