Yes, anxiety can increase your heart rate even if you have taken Klonopin, etc.

Also, sometimes the medical assistants take my vitals right after I walk down the hallway into the exam room (which is difficult for me), so my heart rate can be very high, and it has to be rechecked a little later.

I've noticed that when my anxiety is high, I'm disorganized and distracted and my memory gets worse. It may be at least contributing to your problems right now, too

I hope that your blood tests come back better than expected