I am sorry this has all gotten so mixed up for you but I do have to agree you need to be under the care of a physician. Trying to dx yourself is dangerous. an incomplete abortion can cause you the very sx you have mentioned.
Different hormones leave the body at different rates. Within a few days after the procedure, most of the hormones have dropped down to a level to where women start to feel "normal" again, but they're not completely down to their pre-pregnant levels. The hormone, human chorionic gondotropin (hCG), which is the hormone that pregnancy tests look for takes quite a while to completely leave the body. Pregnancy tests can be positive up to 8 weeks after the procedure. This is why you shouldn't take a drugstore pregnancy test soon after the procedure. It will be positive, and it'll just make you worry unnecessarily. At your post-abortion check-up (2-3 weeks after the procedure) your physician will use a low-sensitivity test, which should be negative at that point.
For your own safety, see the physician and be sure you are OK. I do not believe he is trying to rip you off or gave you bad info.
Get yourself an OB/GYN if you don't trust this doctor.
Take care and let us know your ok.