Is this fluid or fat under my breast? (Photos)

Unfortunately it's difficult to say without seeing a photo without the bra on. I would advise raising these concerns with a surgeon who would be able to identify whether this is fluid through an ultrasound scan. 

Thank you for your question and so sorry that you had complications following your procedure.  Your photograph indicates that your scars are in fact showing below the infra-mammary fold.  You are wise to seek a consultation with a board certified plastic surgeon to discuss options.  Best of luck.

In the process of placing a breast implant, the inframammary fold is lowered from its original position. When the implant is removed, the remaining breast tissues return to their original position, leaving the area below deflated with a fold of excess skin and the scar on the chest wall. This is not fat. It is not likely to be filled with fluid, and is difficult to judge without physical exam. Placement of a new prosthesis would correct the issue, or removal of the excess skin could be performed. Keep in mind skin removal will result in a larger scar. Take care!

Matthew C. Camp M.D.
Board Certified Plastic Surgeon
Member of the American Society of Plastic Surgeons 

Sorry for your bad experience.  Fluid 1.5 years post-op would be unusual.  It's impossible to tell without an in-person exam, but you are likely dealing with a bit of loose skin as a result of having the implants taken out.  I'm glad that you have a plan to have this taken care of and get a better result.  Best of luck to you!

I am sorry to hear about your past experience. Fortunately, most patients to do very well with visions. It is difficult to determine from a single photograph what maybe going on, but an in-person consultation will is to develop a treatment plan to achieve your goals. Good luck.