*hugs*
I went through the vCJD-fear stage about 10 years ago, or whenever it was it was first in the news, when people were projecting it could be an epidemic. Like you I got a twitch in my hand - might have been my left thumb. I also developed a twitch in my eyelid which lasted two months. I didn't know at that time that twitches are a really common symptom of anxiety. It subsided eventually.
To this day I don't eat beef.
You're really panicking about it which is making a vicious circle of symptoms, but it's really good that you went to your doctor. Talking to a counsellor may help too. I think daisyd hits the nail on the head: look at what is hapening in your life at the moment and it's a pretty significant coincidence that you're coming up to this huge life-changing thing, and you've developed panic.
This is exactly what happens to me - for whatever reason I seem to displace my anxiety about huge real things (which I feel consciously quite calm about) into health anxiety about completely unrelated imaginary things (of course they don't feel imaginary at that time).
I rarely revisit the same health anxiety more than once, so I've 'had' vCJD now - perhaps it's not scary enough any more. Currently I have early onset Alzheimer's instead (I'm 41) and although I deduce it must be health anxiety because it's so improbable and health anxiety is what I do when I'm stressed, it's still hard to fend off that part of me that thinks, yeah, but, maybe I really am ill this time, and degenerative brain disorders are the scariest thing ever (of course I have to give myself the scariest thing ever - coincidence?! - you know, I'm at the point I'm wishing it could be cancer instead).
Really: been there done that and I sympathise completely with you. All I can stay is stop googling scary things and google about anxiety, if you must google at all.