Do i have herpes? please help me im freaking out!

ok so here is my story. 

1 day i went to a party and i got a bj from this girl.
i have known her for 1 year. After the party i went home and went to bed. 3 weeks later i jacked off and used shampoo as lube. After i did not shower and i went to bed. In bed i did scratch my scrotum and i MAY have cut it, it kind of felt like that. Than i had hockey and my scrotum hurt. I got home from hockey and did not shower tell the next morning where i found out i had blisters on my scrotum and 1 small on on my head of my penis. There was no discharge all that happened was it kind of dried up and than went away in 4 days. now every thing is normal and it has been 2 months. Now im freaking out again. Plz tell me what you may thing it is. THANK YOU SO MUCH FOR COMMENTING. Oh and i went to the Doc and he said have you had any sexual contact and i was to scared to say yes so i said no. But he did give me cream and it went away in the night of the 3ed day . k thanks