This morning at 3:30 am, my usual time for waking, I sat up on the edge of the bed and realized that my heart was beating both very fast and very irregularly. I knew what it was, generally speaking. I have had two other episodes, though one was diagnosed as tachycardia plus arrhythmia and the other one as atrial fibrillation: http://anti-itisdiet.blogspot.com/2007/ ... ation.html
I thought that by deep breathing I might be able to get it to settle down. By 4 am, I knew that was a failure and called 911 (I don't have a car) and went to the ER in this small town's hospital. Their diagnosis was simply tachycardia. (I could feel the irregularity subside as I waited in the ER briefly.) It peaked at 150 bpm but has now settled into 120 bpm, from the ER to now, about 12 hours later.
The ER physician tested my blood and found no proiblems except a possible anemia slightly out of bounds. She said she would ordinarily ignore it, but noted it on the report to me and my doctor as something to follow up. She ruled out thyroid problems. (Not a sign of it she said.) However, I was definitely dehydrated. I have not been thirsty, so maybe my thirst-detector isn't working or I have been ignoring it -- probably the latter. (I have since then started drinking 1 cup of water per meal and 1 between meals, for a total of six per day.)
She tried two approaches: a water drip, which failed to stop the racing heart, and then an injection of valium, which also failed to stop the tachycardia.
The final ER recommendation was to live with this until Monday morning and then go camp in my doctor's office until she can see me.
I am able to walk, somewhat slowly, and climb stairs, very carefully. My appetite is ferocious as usual, and I can think clearly.
My BMI is 18 and I don't consume any stimulants (a common cause) such as tea, coffee, alcohol, street drugs, or certain pharmaceuticals. Perhaps my doctor's further research will uncover a cause -- even though three hospitals have not.
The important issue for me is what is the cure for this now chronic condition? A drug to suppress the heart rate, or is there a version of cardio rate conversion that will reset the rate, as was done for my afib?
P. S. -- Thank you to all who have contributed to this thread. I have learned about some possible causes, which I can discuss with my doctor.