I spent several months in Fiji last year and fell ill there. I was extremely exhausted, dizzy, thirsty, my blood pressure was on the high side and could not concentrate. I did not have fever though and I treated the whole thing with paracetamol as diagnosed by the local doctor.
Now, 9 months later, I seem to have similar symptoms (yet less severe). But at the same I got an infection on my back. First a few square centimetres of my skin got red and itchy (as if several mosquitoes bit me) and then it turned into a painful boils. There is no puss or any fluid of that coming out so the doctor did not know whether it was a simple skin infection, shingles or something else.
So I'm thinking it might be a some kind of recurring tropical disease.