My youngest has asthma, so we wanted to get him done as everytime he picks up a cold (wich is rarely anyway) it goes straight to his chest, which is one of the main problems with swine flu, so i wanted to avoid it. My oldest got done too. They are 5yrs and 22mths.
Docs at our surgery had a day of imms - literally, all docs and nurses were immunising - i was joking with the other mums there, that tesco won't know what hit them that day, as we were all off to tesco after the jabs to get treats!
Both mine were fine.
No swelling, no flu symptoms, nothing. Neither needed any calpol, as no fever or pain at all.
I was in two minds about getting it done, but after much research, i decided that if i didn't get them done and then they developed it and it was bad, then how would i feel if i had been given the chance to immunise them and had not done so.
Personally I think it's a good thing for those who need it. And it's also a very difficult choice. I don't think its a choice that any person can help you make though. You just have to research it and go with what you think is best.
I remember being exactly like the OP, not knowing what to do for the best - right up until the minute before they had it done. The Doc helped me though, by saying that in this area, people are still being admitted to intensive care with problems from swine flu, so although it's dying down, it's certainly still there.