hey hun, i had a similar problem where i pulled one of my stitches out by moving a bit too quickly (they were put in badly to begin with, had to have 4 removed after finding one had ripped out) Also had an infection in the little gap that was left. It is agony, and i used to think i was bring really dramatic about the pain lol!
I used arnica tablets to reduce the swelling and takes the pressure off a bit. use a jug of water when u pee to dilute the urine (less stinging) pour as you pee. bath in the morning and in the night to keep it all clean. and sit down as much as possible! it will only aggravate if u do too much too soon.
go back to the doc if antibiotics have finished. mine worked within 7 days and i had oral antibiotics and a steroid cream to put 'down there' as well. keep topped up with pain killers! good luck xx