That's why I wonder if it has to do with anxiety.
Wow, 90 bpm is a lot better than my normal 140-160 bpm. And if I do not throw up, it continues for hours. I have had to be rushed by ambulence several times. At 150 bpm, they give you something to slow it down. But yeah, something sounds very, very off with the urinating and bowel problems that seem to be associated with it.
I don't always feel like this but I have lately, it's so weird and I have to urinate constantly too. I first got like this when my husband and daughter kept snoring since they were both congested, I was so irritated. Then I got used to taking benadryl everynight to make me drousy. Now it no longer works on me and I just couldn't go to sleep last night because my heart beat was fast, mine was about 95 per minute but my normal is 70-75.
I meant to address the comment I made towards you :)
I am so glad to hear that someone else is experiencing the same thing I am. If I eat within 2 hours before going to bed, my heart will speed up to about 150-180bpm. If I throw up, I gain instint relief. I do not know about the bowel movements, but as far as the rapid heart beat, I understand. Doctor's have told me that "I am young and my heart is fine". If that were the case, then why do I have a problem with my bpm? I have had everything from Halter Monitors to EKG's, nothing shows anything. Sometimes I have a problem with palpitations, and go figure, the doctor's said that was from caffiene when I don't even drink any.
I hope that my reply made you feel like you aren't alone. If you need to write me, feel free:)
If you remember having a "nightmare", then I'd bet the emotional state caused by the dream caused your HR to rise, just as it would if you were experiencing the same event in real life.
You heart is speeding up to help you deal physically with the threat seen in your dream.
You've seen a cardiologist, and I think that's a good action. Given the results I think you should just try to put the whole thing out of your mind and get on with life. If it happens again, and there is an associated nightmare, I'd again assume you heart is just acting as "designed".