Thanks for your question.
I think you are suffering from two different problems. One is a complicated upper respiratory tract
infection & other is probably an insect bite. You have tried antibiotics & since there is no relief you should have a Throat swab test to confirm the causative organism. A specific treatment is more likely to be successful.
You should visit a doctor for the proper treatment of your allergy
& leg blister
. Otherwise your problems may worsen.