Welcome to our Forum.  I'll be pleased to comment.  let me first comment on the easy parts of your question.  Following the encounter your describe- receipt of condom protected oral sex followed by receipt of masturbation, there is no meaningful risk for having gotten HPV, herpes or any or the traditional STIs such as gonorrhea, chlamydia, HIV or syphilis.  No risk, no need for testing, and no reason for concern.  The condom would have prevented STI transmission during the oral sex, no STIs are meaningfully transmitted through receipt of masturbation, even when a partner's genital secretions are transferred during masturbation activities and no STIs are transmitted in saliva.

I would not be at all worried about the events that you describe.  EWH

If I were you, I would not be worried.  Your decision to abstain is a personal choice but I am not sure what would change if you were to wait 10-15 days before resuming unprotected sex with your girlfriend.  If you need to prove to yourself that you did not get infected with usual STI bacteria such as gonorrhea and chlamydia, you should get tested now and believe the test results.  If you are worried about herpes, you are correct that most outbreaks from newly acquired herpes occur within two weeks of exposure. 

Thisis my third reply to you questions.  As per Forum guidelines, this thread will be closed later today.  EWH