Shelly,
Calm down

You know you're having a panic attack and you know the phen's not helping the situation.

So ... repeat after me, "I, Shelly, am just
wigging out but i will be OK after I pull myself together!
Phentermine is "intensifing the effect"

and you know this. Your paranoia is drug induced. Even if you get this way when you're not taking phen, you know that right now phentermine is adding to it.
You can either quit taking phen and try to calm down for tomorrow, call your Doc and get some drugs ... but this just covers up the problem ... or you can try to reason with yourself.
You know that most of these feeling are in your head. Have you recently watch that movie, "Final Destanation"?
QUIT WORRYING Worrying doesn't help! Worrying has never prevented anything bad from happening or caused anything good to come about. All worrying does is drain you, waste your time, and keep you from getting important things done!
I KNOW! I am a WORRIER
Someone once told me,
"People don't cause or make you to do things ... YOU LET THEM" When someone does something that upsets you, could they have upset you if you hadn't of let them? If someone says something that upsets you, did they upset you or did you let them upset you. See ... people, things, and events dont cause you to feel one way or another unless you let them. So, even if phentermine is intensifying the paranoia effect, you are allowing this to happen. You know this! So quit worrying about it and wasting time! Pack up your **** and start dreaming about "sunny warm Florida."