Hi Apoorv,

I never had any of the problems like you mentioned lasting so long, it would usually come in the afternoon or early morning and then stop after
about an hour.
You may want to go in for a sleep study to see what's going on and have an e.e.g. and e.k.g. done all at the same time. I can't help but wonder if you are having seizures in your sleep which in turn can cause the anxiety sometimes.
Try cutting back on the caffeine and any foods with carbs or starch in them and see if that helps. I wish you only the best and May God Bless You!

Sue