What kind of infection could be responsible for heart attack like symptoms?

[Vaelon]

I recently returned from a trip to the Philippines.  Three days after returning, I developed diarrhea and a fever of around 100 F.  The following day, I also added a stiff neck and headaches, especially if I moved my head too quickly.  I went to see my PCP the next day and started Flagyl and Cipro.  That night, I was very restless and had a jaw pain in my lower jaw and a tense feeling in my upper chest.  The symptoms returned, but much more severe the next day and I went to the ER.  My bloodwork showed 'significant' elevation of troponin and the cardiologist insisted on doing a cardiac catheterization right then.  It showed no blockages and I was released.  

I have since had two more episodes with the lower jaw pain and some upper chest tension/tightness.  My fever and headaches are gone, still some diarrhea but quite a bit better.  

I'd appreciate any thoughts on what tests to request from my doctors next or any ideas on what I might have contracted.  I should note that we are waiting on results from blood infection cultures and stool sample.