Bad beats happen, if you feel you need to take a week off to get over them then do that, although eventually you need to be able to not notice them.

If you managed to build a bankroll and make it to 100nl you must've been doing something right. When i moved to 100nl i had lots of trouble, i played too weak and tight, even now i have some issues with my game, but i'm still profitable and i feel like lately i've turned a corner with my play. Succes doesn't come over night, and as long as you aren't losing money i don't think you should just quit NL holdem, you just need to work on your game.

You pretty much have to make use of implied odds to win in Nl holdem. You have to compare the odds of you hitting to the amount of money you think you can seperate from your opponent. Almost exactly the same as pot odds, except you are using future bets. Learn to use them well and you should be much more successfull.