LC - I hope you feel better.
Have you thought about how you seem to get ill a lot around the end of traveling/being alone? My partner, when faced with certain sorts of stress almost weekly, would and still can always get physically ill - bad cold, sore throat/flu like symptoms or with stomach flu sorts of things. It is usually at the end of such stress - after it is over.
She has made some hard changes in dealing with her awful family and in work in recent years and is not sick as much.
Just a thought.