Why do I still have breast pain and a wound that won’t heal? 7 months post-op.

I had a breast augmentation at the end of Dec. 4 weeks later they got infected and were removed. A culture was done that showed no growth. I have been dealing with pain in my breast and fluid draining from the incision. I have been out on doxycycline, augmenting, and bactrim. Bactrim was the only med to help but three weeks after stopping the antibiotic my symptoms returned and my almost healed incision opened up. I have had an ultrasound, CT scan but nothing shows any problems in my breast!