So long as this doesn't progress to more serious symptoms (especially fever), and doesn't get worse (it seems to be improving), and doesn't last more than 72 hours, it's probably ok to just wait it out. If it should get worse or lasts longer than 72 hours, definitely be seen by a medical professional. Your GI tract will generally throw out stuff it finds offensive, even on aesthetic grounds, but given the situation where you are, it's possible you could have picked up something infectious. You should know soon enough. Again, so long as it doesn't last long and improves with no new symptoms, it's probably just purgative in nature. If you start to feel ill, by all means see an MD. Sounds like it should be fine, though.
Good luck to you! Follow up with us as needed.
John Kenyon, EMT, CCT
Non-invasive cardiology tech, Emergency and Critical Care technician, Critical Incident Stress Mgmt. specialist