POTS or Anxiety

When I stand up my heart rate goes from 70-80 to 120+. In the other hand since April I experience panic attacks after 1-2 weeks in the gym and the nausea scares me a lot. During that time my hear rate stays like 100 at resting and goes to even 160 when stand up… My physical symptoms put me down.. I have been a little bit anxious as kid but nothing more than some fear before exams, job interviews and etc. Also experiencing some strange feeling like pulsing in the ears when trying to do things faster like typing, scrolling, walking and etc. I have constantly to remain myself to do them very slowly

Went to a therapist and she said its anxiety and gave me escitoplam or something like that which i took only 2 days per 5mg but my heart rate went even higher.

Later today I have an hour for cardiologist but just wanted to ask you here people is someone experiencing such things and whats the cause?