For some odd reason the last couple of nights, I have this persistent feeling in the center of my chest like I have to yawn, but can't get it out. Almost like I can't catch a full breath in a way. Triggered 2 panic attacks last night.  At first I thought I had shortness of breath but I'm breathing just fine.  I've been taking 50mg of zoloft for about 2 months and over all my panic levels have gone down tremendously. I can drive and work a full time job now and overall life is pretty decent. I'm sure I can't be the only person this has happened to