Cag That's a hard thing you've been through with that drug. I'm sorry to hear that. Well done for having come so far since then. You're a star.
About the drug - I think that "inhibiting reuptake" means this:
The fight or flight hormone is released as a natural and healthy process into your system to mobile your body into a fighting state during times of stress.
In order for it to do its job it has to travel round your body and get to the places where the extra fighting power is needed. For example your heart, which needs to pump harder, your leg muscles which need to work harder to run, and your lungs which need to breathe harder to supply the oxygen for all this work.
I think that when the hormone reaches those organs, the organs have to "take it up", which means that each little hormone molecule has to bind to a protein in the organ, and stick there. This is more or less like a key slotting into a lock in the organ (heart, muscle etc).
When the drug does its "reuptake inhibiting", I think that it is effectively inserting a dud key into all of the little locks in your organs so that the fight or flight hormone can no longer enter those locks.
So in effect, your body was flooded with fight or flight hormones because of stress, but the hormones couldn't lock into the organs that were meant to respond to it. The hormone was still there though, pumping round and round aimlessly.
The problem I see is that the hormone is not broken down until it slots into those locks. Slotting in to the lock is the trigger that causes the hormone to fall apart and be processed down to component parts for reuse. If the locks are bunged up with a drug then the hormone can't be broken down and your body cannot naturally reset to a resting state.
From my view of it, I'd much rather do lots of fighting and fleeing (and angry house cleaning) so that the hormone can bind the locks in its natural way, and be naturally broken down. It seems much healthier than just bunging up the system completely with a drug.
Does that make sense? I'm not an animal biologist, I do plants, but I think I'm getting that right. I'm not sure why your heart has been funny since then. Physiology is very complex and there are all sorts of reasons why that could happen I suppose. Shame for your poor heart muscle though. 
and 
for it.