This could be just a common cold, I would assume you have gotten cold sores in the past?
2 days is really too soon to see any symptoms from herpes or syphilis. So I think it is just a cold, but you can see a Dr if concerned.
Oral sex is low risk to aquire gonorrhea, syphilis or herpes.
thnx... my sore throat went away now congested with a cold... im not going to worry my self to death anymore....