dear friend , thanx for sharing you concern,
you have already taken several course of antibiotics. so please don't go for any more.
these antibiotics have several side effects too, so take it only when required .
now trust me dental treatment appears horrifying but it is not so. you have to relax and make up your mind for getting the treatment done for the betterment of self.
an abscess tooth has to be treated certainly, because it can lead to deep infections in adjacent spaces or areas. abscess contains bacteria and bacterial products along with pus . so it should be drained as soon as possible so that it does not spread.
this is not to afraid you, but to explain you facts for your good health.
remember a dental abscess
has to be treated by abscess drainage
then RCT, prosthetic crown along with antibiotic and analgesic
i would suggest you , go to your dentist
explain your agrophobic nature and i am sure they will try and provide you with utmost painless treatment .