Problems after having wisdom teeth out?

I had one of my bottom wisdom teeth extracted 4 days ago, i didn't think ther was any problem at first, i got alot of swelling and bruising which was expected but i have been having a strange taste in my mouth since yesterday which is not tcp thing that he packed the wound out with before putting the stiches in, ive just took a closer look and i think there is a hole in my gum that hasnt been stitched properly, its pretty painfull, do u think i need to go back or will it heal on its own? i'm scared to eat incase something gets in there!