What's a blood doctor called? Minor sores on my hands don't seem to heal quickly, I take extra vitamin E

and I keep having bouts of sweating profusely like my bodies trying to get rid of toxics.....yeah, I'm over 50, I know about menopause, feels different than that though? Thought maybe I should go to a blood doctor to see if my blood toxics from all the medications I've injested through the years...I'm still on a constant regime of pain killers, hate it. .Is that what blood doctors do, or are they just about diagnosing cancer?