Feeling rough after a gig

I went to a gig last night (first trip out since november)! It was all seated so i was relieved and it was going great until the band asked everyone to stand up. The last half an hour everyone was stood and i had no choice but to stand. If i sat i couldn't see a thing, and i hadnt paid money to go and sit and stare at peoples backs and not see the band for half the show. I was really frustrated and in pain.

Now its the morning after and im in crippling pain. Everything aches and hurts. I feel horrendous. I hate my body, most people dont feel his awful after going out, so why must i? Just feeling really lousy and disappointed this morning:(

Has this happened to anyone else before?