Vertigo can be a very unpleasant sensation and is certainly would warrant seeing you primary care physician
. Depending on its cause, vertigo can be treated by your family doc, an otolaryngologist
(ENT doc), or a neurologist
. Caffeine intoxication can occur from just drinking too much coffee, but you have to drink quite a bit. The symptoms of caffeine intoxication are usually muscle tremor, irritability, insomnia, heart palpitations, headache along with many more. The only "middle ear" side effect reported to be common is tinnitus (ringing in the ears). Therefore, if your girlfriend's vertigo is caused by caffeine, this would be quite unusual. Although it is still possible that she is having an atypical side effects of caffeine, it is more likely that she has another condition that is causing her vertigo. The most common cause of vertigo is something called Benign Positional Vertigo (BPV). This is (as the name implies) a benign condition where a small stone in the inner ear known as an otolith gets out of place and makes the brain think that the body is spinning. Just like spinning in real life, this can cause nausea and vomiting. There are several other causes of vertigo that are much more concerning including serious middle ear infections and even brain tumors. Therefore, I would not hesitate presenting having her see her primary care physician, ENT or neurologist as soon as possible. Good luck.