When you say that you had oral sex, did you give or receive the oral sex?
Your symptoms don't sound much like a cold sore to me, and the genital symptoms don't sound herpetic either. Oral herpes usually lasts longer than a day or two, and genital herpes would usually have more symptoms than you are describing, if you were to have symptoms. Have you had any herpes testing done yet?
Terri
Teri