I just wanted to let you know that I have gone through--and still am going through--the very same thing...it will get better. Learn to meditate, get a massage, and know you are not alone:)
I'm not a doctor, but there's no doubt in my mind that you do have some pretty severe health anxiety. When it affects your life to the point of not going on a vacation because you don't know where a hospital is, to put it bluntly, totally out of control. But you know that, don't you?
I was going to write a fairly detailed post about all your symptoms and attempt to show you that anxiety is no doubt behind all of them, but when I read that you didn't believe the MRI results, I decided to save myself the time as you won't believe me either.
My advice is to revisit your doctor and discuss all your symptoms. He/she will probably conclude it's anxiety, but I doubt you'll believe that. (I'm not being snarky here, those of us with health anxiety don't believe anybody!) Seeing a cardiologist would answer all your questions about your heart, strokes, aneurysms and palpitations. The brain tumor was no doubt ruled out by the MRI, which you didn't trust.
One thing I would like to interject here is that many doctors do look at our symptoms of anxiety and stop there........anything else we say just reinforces their belief that we're "Nervous Nellies..........Anxious Annies," and they send us home with a big bottle of "Valley of the Dolls" pills. Anxiety should be the diagnosis ONLY after everything else has been ruled out.
Having said that, see your doctor. Ask for a referral to a cardio. See as many doctors as it takes to rule out every single one of your symptoms. If they say you are fine, you have to find a way to believe them and begin to deal with your anxiety. You do that by getting into therapy to figure out the root cause of your health anxiety, and trust me, there is one. You can also work on your fear of death and what may or may not be waiting for us all.
I don't know how you feel about medications, but at this point I think you could benefit greatly by getting on a long term antianxiety drug. That, along with the therapy, will give you some badly needed relief from the anxiety and give you your life back. You've suffered long enough, you've lost enough time that you'll never get back..........it's time to face down your demons.
You'll be fine, but YOU have to drive the bus.
I hope you'll keep me posted, let me know how you're doing, OK?
Peace
Greenlydia