Usually they use herbs, but if they are also a traditional doctor they can prescribe meds such as an antibiotic if necessary. They look for the cause of the illness and work to eliminate the illness. They don’t just treat symptoms

Functional Medicine doctors are MDs who try to find and heal the source of symptoms, not just treat the symptoms
They use conventional Western medicine, nutrition, herbs and eastern medicine. You can research functional medicine physicians near you. Other people do practice functional medicine that are not MDs ( nurses, etc) so you need to check that they are also an MD. They are not available everywhere.

I just want to say that I am currently relieved of the breathlessness, most of the fatigue, and the perspiring has cut down some. My hands still tremble and the night jolts continue, and the smell in my nose comes and goes. Sometimes I don't have it for days and then it comes back--its not so bad. Is it because of passing time, the regimen of supplements (herbs) I am on? It's amazing because there are only two per round. Each round is three weeks and I am into my second round. I have an appointment next week with the provider and look forward to the results of the "not so ordinary" bloodwork up.