Good evening doctors. i have extremely frequent urination at night--sometimes i get up 5 or 6 times a night. is this sleep apnea, bph? what type of doctor is best to see for evaluation and treatment?

Can be a number of things. At your age I would consider all you list as well as having a low body/blood potassium. Esp if you have high blood pressure. Start with a good family practice Dr or Internist.

Sleep apnea alone does not cause nocturia (frequent urination at night). If the flow is weak or sluggish with interruption and volume is less than 100 cc, BPH is likely. Rectal examination can confirm the diagnosis and medical treatment is most often effective. Either primary doctor or urologist can take care the problem. Combined sleep apnea and BPH worsen the symptoms.

Although sleep apnea can interrupt sleep and awaken periodically, it does not cause urinary frequency. At your age, the most likely explanation involves prostate issues, with benign prostatic hypertrophy the most likely answer. Contact a urologist and have this addressed.