Chronic tropical diseases?

When I was teaching in St. Thomas USVI in 1994, I started getting these mysterious fevers.

It would start with my fingers, toes, and nose becoming ice cold (so much so that my nails would turn blue) as my fever would climb to dangerous levels. I would have such serious chills I couldn't do anything, and sometimes all the shaking made me lose my lunch.

Ibuprofen and acetaminophen would bring the fever down and then I'd be right as rain for a few weeks, a month or two, then the same thing would happen.

This has been happening to me five or six times a year ever since, most recently on my return from New Delhi India yesterday. Now, the fever breaks and comes back in an hour or two which is something new.

My question is this: is it possible I picked up something in St. Thomas that I've never completely shaken – some kind of chronic tropical disease?

I'm going to the doctor this afternoon, but would like some non GP opinions.