Panic attacks....or something worse?

I have a history of severe panic attacks. Like, on a scale from 1 to 10 sometimes my anxiety levels reach 257. Over the past few months I’ve experienced the worst panic attacks of my entire life. Multiple visits to the E.R 100% sure that I am dying. I get there & the only test they do on me is a drug screen. (which is always negative for everything) I don’t drink or take any drug other than the ones prescribed to me & those are mostly allergy meds the DR. says help with anxiety. They really don’t. The Dr.s always say it’s just severe panic disorder. The thing is, I’ve dealt with panic attacks for almost twenty years now & these seem very different. They’re much more aggressive and almost impossible to calm myself out of. Another thing that concerns me about these attacks is that a lot of times I will wake up in the middle of the night and already be in full blown panic. There’s no trigger what so ever. They just happen for absolutely no apparent reason. It really is enough to make a person lose their mind. I guess my question is, does anyone else out there suffer from these kind of attacks? And if so, have you gotten any real answers from medical professionals? Not to beat a dead horse, but let me reiterate. These are not “normal” panic attacks, they are so much worse. Along with all the normal symptoms of panic attacks these also come with a traveling numbness, nausea, blindingly painful stomach cramps, & they can last anywhere from an hour to several days. Waking up already in full blown panic is what really confuses me. If you have any experience with these kind of attacks I would be grateful for any advice on how best to deal with them.