First, there is no difference between a panic attack and an anxiety attack. Just different names for the same event.

Feeling strange today is a result of the overwhelming energy/effort put out by your brain last night. Back when I was still struggling with anxiety attacks, it would often take me a few days to recover.

Relax, eat right, and try to get a good night's sleep.

Glad to hear the gabapentin is working for you. Your response to such a low dose is good. Your brain just needs a little bit of help.

That sounds promising.