Those doctors would mostly be psychiatrists/psychologists, neurologists, ENTs.
A neurologist or orthopedist .
Oncology is the branch of medicine you will deal with after a diagnosis of cancer. The Doctor in charge of your treatment will be an Oncologist.
This type of doctor would be an Endocrinologist.
Anti-psychotic
The type of lawyer that would deal with traumatic brain injury case would be medical lawyer, which is lawyer who has extensive knowledge in the field of health and medicine.
A surgeon
A gynecologist.
of course doctor
hemotoligist
For musculoskeletal problems, the type of doctor/physician to see would be an orthopedist or orthopedic surgeon. Probably a physician who specializes in sports medicine would be best.
Talking to family doctor can help with getting information on Gastric Bypass.Also looking at the different doctors who deal with this type of surgerys and their websites would give information on how they do things.
Neurotransmitters; principally serotonin and dopamine.