Hello~You did not give us any indication as to what your feel your problem is, so, it is hard to recommend any type of doctor. I will say, I think you should see a Naturopath, they delve into issues such as yours very deeply, run many tests, some of which the "main stream doctors" don't even know about, and then they will start to prescribe solutions such as possible diet change, herbs, vitamins and minerals, etc. They may also suggest some acupuncture treatments, for me and others, they have helped immensely. Most in the US are allowed to write prescriptions as well, so, if they feel one would benefit you, they would do that as well.
I hope you start to feel better soon. God bless you.