It's nice to see another 20-something student here!! I've taken a lot of tumbles from being a straight-A student in high school, too, so you aren't alone there.

-When you find a cocktail of meds that works for you. How likely is it that you will stay "normal"/stable forever or many years? Will a person still have the extreme highs and lows?
Personally I've still had quite a few ups and downs, but they've been less severe as I stay on my medications. I slipped up and didn't take them for a while, though, and that screwed me up bad. Stay on the cocktail as best as you can when you find it!

- Can a person with bipolar 2 live a completely "normal" life, just like everyone else? With a career and family?
I think so, yeah! I know of many folks who have BPII and lead "normal" lives, though of course they'll still have their ups and downs, too; bipolar disorder seems to be a life-long deal, y'know? But it does really depend on the person, treatments, situation, etc.

- Does everybody get back to "normal" after a depression, I mean when it comes to "brain activity"? Right now I have problems reading, spelling, concentration and so on.
After depression, I find it usually takes a while to get back on track. Problems with concentration and the like will go away in time, but it all really depends on the person.

Hopefully these helped a little! I'm not too far along out of college so I can't say I have all of the answers, haha.