I had the swine flu jab about ten days ago (a couple of weeks after my seasonal flu one).
I did have a sore arm afterwards - no lump, nothing to see, but I couldn't sleep on that side for a few days, and I had problems lifting my arm over my head. I had the jab on a Friday and it was all better by Tuesday.
I had to go to the gym on the day after the jab, and wasn't at all sure I would be able to do much. My trainer left out weights and skipping from my routine and told me to tell him if anything else hurt, but I actually managed the pressups without any problems and the only thing that really hurt was a reverse pull-down.
I didn't feel at all ill - apart from the arm I had no side-effects at all. But everyone's reactions are going to be different.