My 3.5 lb. furbaby is terrified of storms and does the circling thing---over my legs, over my head.  Tried the valium thing and it had no effect.  Just lately I ordered an herbal remedy called Petcalm.  The first pinch doesn't seem to affect her much, so I make sure that I give her a pinch when I know a storm is coming and then give her another when the storm hits.  She's still scared but she doesn't get so terrified that she pants and circles endlessly.  I too am scared that she will give herself a heart attack.
 
 
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 Joanne  

Eli 

Chipper

Eva 

Snowboy 

Rosie(R.I.P. 1996-July 29, 2013) 

Cocoa(R.I.P 1998-April 26, 2012):