Seems to me you're a man of extremes, it’s all or nothing with you -

Then I decided "I will learn to play lead guitar!"... I mean as in solid, "oh wow, did you go to MIT" level playing...

Starting playing MW2 on Xbox, while practicing guitar about 1.5 - 2hrs a day; VERY disciplined practice

I'm a kick ass sniper on MW2. I sell my XBox

So I'm really close to accepting that it may not be physically possible to continue with playing the electric guitar.

Chill man!

Why such high aspirations? Why the need to be a kick ass sniper? Why sell the Xbox? Why give up electric guitar?

I suggest you take a break, relax and then decide what you want from guitar. Maybe try a more realistic approach bearing in mind the other advice you've been given.

But whatever you do don't give up lead electric guitar! It's such a great thing it would be a real shame to give it up! As for the Xbox how could you sell it after clearly enjoying playing MW2?! Maybe accept that you can't get as good a K/D ratio as you used too....

Good Luck!
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Youtube - jim47ww