My abscess was large too, and I also had to have a second drain put in because there was left-over sepsis. My seton has been in for over 4 months now and I don’t even feel it there. I have heard they can be left in as a life-long thing too, just changed every few years, but it sounds as if yours are being put in as temporary measures.
I initially had 2 setons, but one was a ‘cutting seton’ (looked just like other one), and it laid open a bit of skin in between the abscess and my top skin…. I didn’t even realise it was doing this until it came out during my 2nd surgery.
I do think the lack of antibiotics is strange. When I was recoving from my 1st surgery, one of my drs told me I could come off the anti’s, so I did, and man, in that week I went downhill and fast – the infection grew at such a faster rate, I could see it blackening beneath the skin, and things got worse so much quicker than they would have if I’d been on the antis.
A GP could prescribe you flagyl and amoxicillin if you are worried about asking your GI again, but I am not a dr so I would definitely ask them first why they have not put you on antis to help control the inflammation. I know with abscesses they are pockets of infection, so the antis can’t get to them like they can get to normal infections, but I am sure they can still help control the sepsis. They did in my case and I’ve been on them for months.
Mr drs were also hesitant to cause damage to that delicate area, the muscles are very tricky I do believe. In my case they were worried about unnecessary damage causing incontinence. At least your dr sounds like she’s being cautious and not just going in gung-ho and cutting away at things. I hope you find some answers and relief soon; these things are just awful to deal with.