Jersey, that is what I was afraid of. I had this done twice with my first abscess....it doesn't work! You need a colorectal surgeon to go in an operating room and drain them, and then clean the abscess cavity out, and then let it heal from the inside out....this is the only way that you will get rid of them. Also, the surgeon will use an anoscope to look around for any fistula tracks....mine inserts a dye in the abscess cavity and then looks around with the anoscope from the inside to see if he can see the dye coming out anywhere. I had multiple abscesses until the fistula was finally located...and a seton was placed. Since then, I have been abscess free. I would also ask for an mri to look for fistulas....that right now is the best for finding them.
When they drain them the way you are having them done, their is no way to get it all out, and once the drain is removed, the infection starts all over again. I would set up an apt. with a colorectal surgeon and get another opinion. Good luck....abscesses are no fun.