It can certainly be a stressful time waiting to get tested when someone is worried about what happened. It can be difficult to go off the symptoms you are experiencing as these can be caused by many different conditions or things that you have had before, but did not pay much attention to them because you were not worried about anything.
Symptoms to be concerned about would be if you start getting discharge from your penis, if it hurts when you pee on a regular basis, if you feel like an awareness/itch in your pee tube or if you get sores in the genital area. If this happens it would be good to go to a clinic sooner, but I am unsure how long you will be away or if you will be able to go to a clinic at your holiday place sooner. We normally tell people to wait 2 weeks before getting an STI test for the best accuracy but if you get any of the above symptoms go in straight away.
I would recommend doing anything that can reduce the stress of waiting to get tested. You probably have had stress in the past and you may already have some techniques that can help with this for example exercise, going for walks, listening to music, watching movies etc…
Also have a look at our worry page it has some helpful hints on what people can do to reduce the stress while waiting to get tested.
Let us know if this did not answer your question or if you have any other questions or concerns.