When will the pocket of fluid in my lower back go away? (photos)

When you say your surgeon was not local, do you mean he/she was out of state or out of the country.  If they were out of the country and this was done to save money, I would suggest going back there for follow up.  That's one of the problems they don't tell you about when you go for surgery.  In the USA most of us would pick up the phone and call a friend and explain the situation.  I would say that Dr. Blinski is being very generous with his fee as most would charge 4-5 times that amount for taking over your care.  I'm sorry you are having this problem but as they say, sometimes discounted fees can be very expensive.

After reviewing your long RealSelf file I question the judgement of going to the DR for additional surgery. Now you have a recurrent seroma than needs insertion of a closed drainage system. Since you already used Dr C. Mendieta, why not return and pay for the minor drain insertion surgery with him? Or is he refusing to see you? Than next option is fly back to DR for this surgery. Or if I were to offer care my fee would be a global $2,000 for operative re insertion of coccyx drain and all the follow up care involved. It seems the cheaper way will now become quite expensive. Sorry for ALL you issues.