Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

-Nikki
I also take magnesium, have for many years, it doesn't do anything for me.
@Nikki - a higher priced magnesium is not necessary, in case you want to save on cost. Any kind will do. If you feel a difference, that's great!!! I never noticed anything from all the years of magnesium and all the different brands, etc. I think everyone is different.
Sometimes we just need to take something to stop the panic attack and ease the anxiety. Talk to your doctor about it. See what they think you should do. Maybe seek out a therapist? For some non-medicine relief,
Hope you feel better soon.
Also use a stick figure to see where the physical sensations are happening.
Best wishes.