At some point you're gonna have to learn to control tilt. The only way to get better is overcome these type of issues, its a never ending struggle, but everyone goes through it.

1. prob not a good flop to c-bet
2. I think the rr is ok with a full stack
3. would you do the same with a 6 or 99?

I suggest you buy in full and play proper or play 10NL.