I know what you're going through, I was the exact same way, and the internet really does make it like 239482347 times worse. I've gotten a lot better now though I can't really pinpoint what stopped it for me. It was partly time, and seeing that I wasn't dying, etc. and also finding other things to do so I didn't have the time to scour the internet over every little thing. I also found that when I did have a symptom it was best to control the urge to look it up even if I was curious, because a little anxiety about an issue would turn into a legitimate fear that would terrify me if I looked it up.

this sounds like me 100%. everything you said. i think it's also a help and support knowing that you're not alone with things like this. i know it's scary. i've had many doctor's visits only to go home feeling like "well, if i would have said this, than maybe the outcome would of been different." i started seeing a therapist who helps me through different ways to deal with it. maybe it's worth a try? good luck hun. i feel you completely. 

I think it'd be a good idea (if you're able) to see a psychiatrist. It's a mental obstacle you have to get over, not a fleeting Oh-I'll-Just-Get-Over-It-Myself kind of thing. I bet it would help a lot to talk to a pro about it, who knows a bunch of tips and tricks

Stop watching Grey's Anatomy ;)

It's completely normal we live in a world where we are capable of checking out some symptom checker and self-diagnosing brain tumors.  I'm a pre-med student and everytime I go to some class I swear I have a new illness and I would call my mom to see if there's a family history of it. What helped me was just STAY AWAY from internet sites like that, be aware of your body, that's the best tool. The internet will give you a list of symptoms and then if you're like me in a few minutes you'll feel one of them and want to make a doctor's appointment

oh my god, i have terrible hypochondria. like really bad. sometimes i'm ok, but othertimes i'm constantly afraid that i'm going to die because i'm convinced i'm having a heart attack or a brain aneurysm or a stroke or a pulmonary embolism or anything really. but those are my top concerns.

my doctor told me it was panic attacks, but she was kind of a terrible doctor. she gave me some xanax which helped a little, but you can't be on that long term. a glass of wine tends to help. in the end you just have to be comfortable about the idea of death. its going to happen at some point, you can't live your life in fear.

i hate going into doctors because they don't take you seriously unless your bleeding profusely or something. they usually just act like i'm wasting their time or prescribe me some useless medication (that usually end up making whatever symptom i'm having worse).