After masturbating rather hard the other day, My penis became swollen, well, day after day, the swelling goes down more.. I'm starting to get a few random erections here and there, but my penis is only about 75-80% hard.. Could this be from stress? I'm thirteen...I worry about my future money situation all the time, (I can't stop). And my dad HAD cancer, but was treated, and this week he is having his 4-month Cat-Scan to make sure the cancer is gone..I don't THINK I'm worried, but IDK. Could this be why I can't get really hard? Could stress make me unable to have a hard-on? Also, sometimes, I will feel like i'm hard, but when I look, I'm not, Why is this? Thanks in advance.. P.S, I'm having no pain in my penis, although, When I go to bed, I have to get up to go pee like every 25 min. Well, that could be from all the soda I drink, lol. Also, How Can I relieve stress? (Without Masturbation, cuz I'm NEVER MASTURBATING EVER AGAIN!!!)