Anyone suffer from hypochondria?

I think I might. 
I'm a 30 year old female. For years I've had symptoms of something being wrong, but all tests show that I'm normal. 
I've tried several times to tell myself I'm not sick, even when I'm driving to work and I'm nauseas, hands shaking, and feeling like I might pass out. 
I've told myself it's in my head, and then I had a possible medically induced seizure, which sent me back to "something is wrong". 
I know I have pcos. I know I have a pituitary adenoma that isn't causing anything. I know I get migraines so bad that they form leisuions in my brain. I know this from MRI scans. 
Beyond that...there's nothing. 
Blood tests don't show anything. I spend hours online researching my symptoms, hoping to come up with a "diagnosis" for my ailments. 
And when I go to the doctors, and I get tested and nothing shows up, I feel a bit of depression because it's starting to confirm my worst fear: 
That I am somehow making this all up. 
I would appreciate no rude remarks. This is taking a lot for me to write. Every thing I know of myself, feels like there is something wrong but the doctors aren't finding it. And after this last bout of tests, I'm now starting to wonder once again if I'm just making this all up somehow...