Is it a PANIC ATTACK?

[Sophie]

During the adverage day I'll feel fine then be suddenly overwhelmed by the feelings of panic and anxiety and start to feel like I can't cope / throw up or both. Do you think its GAD? 

[Cordellia Amethyste Rose]

Only a doc can diagnose you for sure, but that sounds a lot like what I go through, and I have severe anxiety.  Good luck.  

[Kacey]

It sounds like panic/anxiety to me. Of course, just like Cordellia says, only a doctor can truly diagnose you. I know how this feels because I have these feelings myself.