Lauren, it's been a few hours since you posted, but I hope that either the Ativan was sufficient to help you settle, or someone took you more seriously, but that you were able to relax a bit, and get some rest.
I get sensations like this frequently, and the first times were terrifying and I had my husband take me to the ER the first time, which was 2 weeks after I was discharged following a stroke. Once anECG, EEG and CAT convinced me that it wasn't something lethal or an extension of the stroke, I gradually learned to live with it.
Every instance of something like this is individual to the person experiencing it, and I sincerely hope it is investigated thouroughly if for no other reason than to give you peace of mind.