Welcome to HCM
We understand your concerns
I went through your problem description and suggest you not to worry excessively. You start doing your normal day to day activities at your home town and everything should be alright.
etc after an extended episode of roller coaster ride and being at resort. There are several reasons. Roller coaster, food, water, sleep patterns, being tired day after day, feeling away from home and friends, etc, etc.
Hope this clears your doubts. Available for further clarifications.