Steve,
I too have exactly what you described from your first few posts.
My Doc says it is atrial fibrillation (AF), and I take Digioxin for that, along with my Lisinopril for BP.
Some folks will have to take a blood thinner as well, because of clotting complications associated with AF
I got really sick a few years ago, never did find out what it was, but a day or so after I started feeling better it all went to hell.
I went to the ER because of the heart fluttering, my hands felt swollen and I had ZERO energy. The "butterfly effect" from AF
will make you weak as hell because your hear is not making a full beat.
I had very high BP and very high Blood Sugar count. BP was 220/115 and sugar was 320.
They thought I was having a heart attack, so they gave me a Nitro pill.
Fluttering stopped while I was there and the EKG showed nothing.

With help from my meds I've been doing very well. BP is 105/60 and BS is around 115-125.
Sorry for all the rambling, but I know physically how you are feeling from that.
Hope all is going well for you Steve and they get you fixed up.
**edit** BTW, I'm 35.
mike