I had it a couple of months ago. Not nice, I sympathise lots. I found it really really hard to eat: I recommend cream of tomato soup - no lumps AT ALL. Fantastic. And don't drink fruit juices: very painful!
Mine took about a week and a half to go from a tiny lump that i could only just notice and back again. Took quite a while for that last bit to go though. Have you had your most painful day yet? Everyone has one a few days into the swelling. I recommend lots of aspirin/nurofen taken as regularly as possible for that day. And probably sleeping pills...
If anyone hasn't had the jab, GET IT. My doc didn't have enough doses to go around so priority went to small children.