Believe me, I know the feeling, I've been there too. Doctors do not have a clue how to diagnose and treat for parasites, which I believe are the root cause of most diseases and pain. Once you get past the anger at their incompetance and feel empowered to move on to healing yourself you can make great strides.
If you can find a naturopath or chiropractor that sells Standard Process products like Zymex II, they would probably be your best bet for having knowledge about fighting parasites. But remember the number one thing is to protect your liver and absorb and expel the toxins when doing any cleansing. Also, if you can afford colonics, it would be great. Colon hydrotherapists are usually knowledgeable about fighting parasites. Otherwise you should definitely get into regular enemas and repopulating with good probiotics. Take care and I hope you're feeling better soon.