I started suffering an unusual cluster of symptoms back in June 2011.
The symptoms began with heart palpitations, feeling weak, shortness of breath, and a strange blackout feeling upon leaning forward.
Two days ago, I had those same symptoms plus a few more: cold sweats, weak legs, and teeth vibrating.
I find that sleep remedies the situation. I must sleep for at least 10 hours, though not all at once, two day in a row.
Afterward I have a dull, aching feeling in the center of my chest. This dissipates over the course of eight hours.
Back in June, two things occurred; I started a five to six times a week exercise program (going from a three day a week exercise program) and I wrote a 129,000 word novel about some serious abuse which happened to me.
My thoughts about what this could be. Anxiety. Panic attack. Hypoglycemia. Lack of sleep (usually symptoms appear after I got too little sleep). PTSD? Heart related?
In 2007/2008, I had Perimyocarditis (inflammation of the heart's lining and the heart's muscle). I was seriously ill with the illness. Some of my symptoms remind me of the Perimyocarditis. My therapist says I have PTSD from having that serious illness.