Extreme anxiety after first treatment, help

Hello. I had my 1st session of TMS yesterday. Neurostar, 5hz, left side, the coil was one-sided, not a helmet. The treatment itself went fine and was manageable. However, afterwards I experienced brain fog and fatigue, and though this side effect was expected, I wasn't ready for what followed. When I came back home and got onto the bed, I couldn't sleep even though I felt groggy. Eventually I felt an extreme tightness in the chest, followed by a debilitating headache. I took Nimesil, which didn't help. I only managed to relatively calm down thanks to one full pill of Xanax, and even so, anxiety didn't fully subside.

Is this normal? Do I just grit my teeth and pull through it? I'm really really scared to go through another procedure.