I would also recommend moving down to NL 10. (On a site other than PartyPoker because the rake will rape you there.)
Your tilt probably comes from inexperience and the fact that you value the money you lost too highly.
Play stakes where you don't mind losing a buy-in and then slowly work your way up.

BTW, taping the $50 to your screen is probably the worst thing you could possibly do at this point.