Google definitely did this to me. I've been having symptoms for 3 months. Started exactly like amyjeannie with head pressure all over, then in one concentrated area above my left ear. I used to listen to streaming radio using the left headset in my iPhone and was convinced it put a tumor in there somewhere. Then I started getting nauseous, cloudy vision (perfect way to describe it) and lightheaded. After my tests came back negative I would've been able to believe I didn't have a tumor much easier if Google didn't tell me all my symptoms were those of a BT. After Google, I started having symptoms I read were indicative of a BT.
Been to numerous doctors who told me I don't have one. Last Friday went to another neurologist (at major university) because although some symptoms have improved, I still have a head sensation on left side, sore/weak legs from time to time, and nausea (has gotten very mild and rare now) which I would like to get rid of. She agreed to take a look at my MRI to reassure me, but she said BT patients have much different symptoms. I haven't heard from her so I assume she didn't find anything crazy yet on the MRI that the radiologist missed, although it was only Friday when I saw her last. I wouldn't need this reassurance if not for Google...at all.