That’s Pretty Bad
If you manage to book an actual sultan’s palace for your honeymoon, the least of your worries would be to catch a somewhat rare disease. For the OP’s friends, they caught legionnaire’s disease on their first night, which meant they were stuck there with inflamed lungs, fevers, chills, and extreme soreness.
Another one of the OP’s friends was the victim of an insect bite or sting, which they just so happened to be allergic to. The friend experienced a terrible seizure and ended up with a couple of broken vertebrae. What is the common factor between the two? They’re friends with the OP. Cut all ties with the OP ASAP.