You could not have gotten chlamydia or any other STD from transferring the escort's vaginal secretions from the outside of the condom to your penis during masturbation. It just does not happen. masturbation, even mutual masturbation is safe sex and does not lead to STD transmission even though when two people are involved secretion typically move from one person to another. You are not going to be the first person to get an STD from masturbating with a hand which might have another person's vaginal secretions on them. As a result, you do not need to worry about your GF either.
Hope this helps. Nothing to worry about. EWH
Thanks for your previous response,
What would cause the symptoms I'm having?
The discomfort could be a manifestation of paying closer attention to your penis and how it feels than normal. This is no at all uncommon following a concerning exposure. What I can say however, once again, is that you cannot get chlamydia from the sort of exposure you describe. EWH
Just an update.
Had urine test and everything came back negative. I want to thank you Dr. Edward W Hook for your analysis.