swellin on gum flat after takin amoxicillin but Very sore

i visted the dentist after a swelling behind one of my top front teeth. the front of my gum was also sore. he said it wasnt infected or an abcess and that id either burnt my gum or a bit of food was stuck under the gum. he gave me a weeks treatment on antibiotics amoxicillin. after the 3rd day the swelling went flat like a mini dip in my gum and was sore. and the front of my gum is red and sore..
now 6 days into the treatment it is almost unbarably sore can hardly eat/drink and the front is very sore and red and i have 3 ulcers on the front of my gum now too. i had been using clove oil for the pain but stopped using that when read that it can cause ulcers..
im due to visit the dentist tomorrow. the redness is directly on the line of the gum at back near roof of mouth and like a small semi circle of reness and where the swelling was there is now a slight dip in the gum.. what could it be though it is just red and sore not swollen or white etc :s ims cared what the dentist eill do???? =( its VERY PAINFUL and its my birthday on wednesday looks like thats ruined =(