Left arm heaviness and pain. Is normal?

Just optimise the doses under guidance of a psychiatrist.

For panic disorder, you're taking appropriate medications, but dose may need to be optimised for full recovery. Consult the psychiatrist for that.

consult

Paroxetine and Clonazepam are fine drugs for a person with Panic Disorder. You must know that Panic Disorder is a type of Anxiety Disorder and someone who has had several panic attacks begins to fear the arrival of the next panic attack. The fear can make a person percieve trivial sensations as being catastrophic. Also, Anxiety Disorders may later lead to depressive disorders additionally, where a person may have several physical complaints which are not related to any serious problem with the person's body. Now, since your Echo is normal, you do not have to eorry about the health of your heart but you do need to take certain steps to avoid stress and manage your Panic Disorder better so that your heart remains healthy in the long run.

Regularly visit your Psychiatrist, either monthly or at least once in 3 months for evaluation. Go for an ECG at least every 6 months and if you are having any problem, do certainly report it to your Psychiatrist and your Physician

Deep Breathing Exercises, Yoga (including Praanaayaam), Meditation, Journaling and Life Style Modification (regular exercises which should include cardio)