My skills in English are not the best, either...
What I wanted to say is:
The normal function of the heart relies on a good balance of electrolytes. (K, Na, Ca) The steps of a heartbeat are like these:
1. Na is absorbed, making the heart to contract. Then,
2. Ca is absorbed maintaining the contraction for several tenths of milliseconds and, finally,
3. K is absorbed and Na/Ca are pumped out of the cells, making the heart to relax.
So, the heart goes:
1-2-3-pause-1-2-3-pause-1-2-3-pause-... (a couple of billion cycles) ...-1-2-3-pause forever, rest in peace...
Kidneys regulate the amount of water and electrolytes throughout the body.
Aldosterone makes the kidneys discard potassium. Excessive potassium would prevent the heart from contracting (performing steps 1 and 2), leading to death by something as simple as eating a banana!
Additionally, another hormone, the antidiurhetic, instructs the kidneys to stop discarding water. Very useful when at the desert at 40 degrees Celsius. [Edit: "Not a surprise that it is produced by the adrenal glands, which produce many stress hormones for "difficult" situations." THIS IS WRONG. It is produced by the pituitary gland in the brain!]
Electrolytes can not be discarded without discarding water, too. Since you feel that you have to pee when your problem happens, I was wondering what exactly your kidneys have discarded. Could it be some useful electrolytes?
If you take steroids, it is very likely that they have messed up with your balance of stress hormones. The heart is very sensitive to them "by design". It is designed to elevate its rate when an angry bear is chasing you, for example. This sensitivity of the heart could very well cause it to respond to some kind of emotional stimuli. Sometimes, emotions that you don't really feel.
I hope that this is not confusing. Again, I am not a doctor, nor this description is accurate in any way. But I advise you to see a real doctor and have these in mind, so that you can direct your questions and understand what he is talking about.
Get well soon!