My doctors have been thinking it's my heart or something but lemme explain what happens.

Basically I feel EXTREMELY dizzy and week.  I feel like I'm floating and nothing is real and I have no idea what I'm doing.  I feel very nervous when this is happening and I cannot stop fidgeting.  My heart palpitates like crazy and it almost hurts, and then I can't breathe and I yawn excessively.

I'm so scared to go places because I feel so restless and fidgety and scared.  Everything just feels so weird it's hard to explain.  Basically I'm terrified I'm dying and I can't work because of this.  I feel like I'm about to pass out CONSTANTLY and I'm sick with fear.  

Anyone else have this?