If you are playing NL and agree with the twoplustwo link - you will lose all your money.

That being said...

-- I have QQ. in SB. This table is somewhat tight. There's a middle position raise, which I reraise to make it respectable. He comes back with a bet that puts me all in.

I should probably fold. But I have so little money that I don't feel like dumping queens right now. He has AK and takes my rack. ---

My thoughts:

I wouldn't dump them in that situation either, based on the limited info you told me. If he only makes an allin's preflop with aces, then I would fold. I have no idea if he does do that, and I don't think you do either.
You were still the favorite pre-flop as well. So tough break, but reload, and that will work out in the long run.

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Next hand (after I visit the cashier)
This time I get the AK and put a big bet in preflop. I get one caller. The flop has 3 clubs, neither of my cards are clubs, and the turn is also a club. Any club beats me, so I check the rest of the way and lose to 77.
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My thoughts

I would throw a pot size bet on the flop, good bluffing oppertunity, and you get a good idea of where you are at by betting. If he calls check/fold, if he raises fold.

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Next hand (I'm not making this up)
I'm in BB so I end up in the flop with T6. Hooray! The flop is 2 6 T
I put a nice big bet in and everyone folds. I gain 0.95, having lost $23 on the previous hands.

What's going wrong? This is a pretty good cross section of the Entire Downward Slide I have been speaking of. It's not from folding too much. It's from getting beaten too much, see?

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If you can't take the huge swings of NL, play limit. It doesn't sound like you can at this point.

To give you an example as I am writing this: (in the past 30 hands)

I am delt KK, raised before me, I re-raise - he pushes all in. I call.

He shows A9s, spikes an ace on the river. I lose.

I have 55 in LP. 3 limpers, I limp. Flop come 8 5 2 (suits not important) Long story short he has 88, and I lose.

I am delt AKs in MP, folded to me - I raise 3xBB, all fold. I win the blinds.

See, it can happen to everyone. Just hang in.