I've always been terrified of having a seizure or a tumor. For 3 months I've been having headaches almost daily. I've been to a bunch of doctors and they can't find anything. I twitch daily and also see flashes of color occasionally, not light. Thinking I had a brain tumor, I had an MRI and it was normal. But recently I've experienced this weird feeling, smelling something for about 2 seconds, feeling a huge wave of fear, suddenly sweating (it was hot in the room though) depersonalization and a feeling of the room spinning or me moving. I never had a panic attack or a seizure before, but I can't differentiate the two because the symptoms are so close to each other. I can remember though that when I experienced whatever it was, I was anxious because I was in public and afraid something will happen the whole day. So I don't know what I'm having. Please give some insight? Do I have a brain tumor, did I have a seizure or was it a panic attack?