Viruses affecting the heart

I am a 27 yr old female who has been very active her whole life. I have always pushed myslf physically in sports and fire fighting training and have never had a heart or health problem. I recently returned from Romania where we performed a medical mission. After coming home on Monday I was sick Fri-Sat morning with severe flu like symptoms. After a 3 negative flu tests at the ER and getting treated for the symptoms they released me with some antibiotics and nausea medication. My problems changed into passing out and nausea spells. I was admitted twice and visited 3 different ER's for a total of 6 visits. After MRI, MRA, EKG, ECG, Tilt table test and blood work they decided that I have neurocardiogenic syncope. However, I have read up on that diagnosis and the symptoms are just not the same. it is now 7 weeks later and after an office visit to a infectious disease doctor, they still have no answers. My symptoms had lessoned a little until the last 2 days. My heart started pounding and I have had constant nausea again. Does anyone have any idea as to what this could be? I also am a single mom of a 2 yr old boy who I can not physically take care of much right now. I also have not been to a 8 hr day at work or completed my second job for those 7 weeks. I am at the point of getting desperate of finding a solution so I know how to treat this and move on. To me it seems like whatever virus I had damaged my heart and I can not function normally because of that. Ideas?