Welcome to HealingWell and the A & P forum.
It does sound to me like your having anxiety and panic attacks and if that is what your physician suspects than I would give the med a try and see if you feel better.
At the top of the forum you will find info on topics that are very helpful to you so please take a look.
We all have the sx you described at sometime or another. There are so many sx when one is having a panic attack.
You can beat the panic. Read the info on CBT therapy. You may find that very helpful.