I would say it's temporary. The fact you slept pretty well, and don't recall bizarre dreams means your serotonin could possibly be lower or lowering at this point. You usually get bizarre dreams when it increases. The fact it may be lowering, would make you a little more tired (and depressive like), causing your body to react by releasing adrenaline to counter it, this is most likely responsible for the heart pounding. That and the subconscious nervousness about taking an anti-D. If I've pulled an all nighter working on a project, around 8am I get heart palps. It's my body trying to wake me up with a little extra adrenaline. Very useful too although not with anxiety
As far as feeling yourself a little later in the day, how do you feel at night time, say around 9-10pm, what's your mood like, what is your state of mind like?