I have not traveled overseas in more than four years, but I have never, never been asked about my meds or had a single issue with them, and I have always heard similar reports from other transplant patients. Until now. It is distressing to read that Jenna went through that, Karol.
I would have been deeply offended to have a customs official ask me about personal medical history.
Uros, what I've heard people suggest is to be sure that your med bottles are properly labeled with your name and the prescribing doctor, and if you can, get a note from your doctor with their contact information. As far as I know, there is no standard requirement for any of this in the US. Sometimes I pack my meds, and sometimes I bring them onboard with me (sometimes I forget them altogether - don't do this, please!!) It is recommended that you carry them onto the plane with you in case your luggage is mislaid. If you have any liquid medication, be sure to contact the airline for instructions.
Good luck! Although I am seething with jealousy that you are going to the Seychelles, I want to wish you a wonderful, fun, and safe trip.