Gum swelled after tooth extraction.

I have undergone a RCT on my 7th tooth which was successful and did not cause any issue for past 3 months. There was a wisdom tooth in 8th position which my doctor tried to do a RCT but failed. So that 8th one was extracted. I was fine till this time, when the gum healed after extraction of 8th tooth, my 7th tooth started paining and it became impossible to keep the cap on top of the 7th tooth which was placed after rct. So my doctor removed the cap and gave me some antibiotics and painkiller. I completed the course but did not improve my situation. The gum was still swelled and it looked reddish. After that my doctor extracted the 7th tooth as well to make me feel better. Still it did not work, its been 22 days, I have completed all the medication but the gum is still swelled, i have pain in there which is not reducing. Added to that, my lower part of chin is swelled and paining. I am a thyroid patient, I dont have bp or sugar. Attached my whole mouth xray