You cant get full value out of your hands if you do not have a full stack (50BBS) at the table. If you are money scared this limit is not for you, move down and fix wholes in your game so you money isn't an issue. If you play good poker the money will be there.

Yes. Raise preflop, i wont talk about this since you already realized it was a big mistake. On the flop you have to raise here, one to get out any draws [ex. diamonds] and two to see where you were in the hand. If you came over the top you can feel good about your lay down in move on but a TAG just calling with AA/set?, seems very unlikely to me in which case i probably would have put him on the diamond draw and would have made him pay dearly to see the cards he wanted.

Dont be money scared, it happened to me once when i moved up to 100NL and went on a -5 buyin with bad play. Moved down fixed wholes and now im playing my A game all the time there.