Hi there ~
You need to give me more information about how the pain came about, what are its precipitating and aggravating factors and such so as to determine what is the right treatment option for you. I think that there is a chance that you might be having a black eye from chronic anxiety
or an old trauma. I would recommend that you see an ophthalmologist to find out what the real problem is. Visiting with a chiropractor may be a good idea but you seem to need an ophthalmologist first.
I hope this helps. Take care.