Trouble breathing.. anxiety related?

Let me give you a little background of what has been going on.

On Sunday night I had a lot of phlegm in my lungs and throat. It was all thick and I kept choking on it so I spent the next 3 days constantly coughing and trying to get it out. NONE of it came out at all.

This morning I woke up at 4 am not breathing. This has happened to me about once every few weeks for years now. I assume it's a mild case of sleep apnea but I don't snore, so I'm not sure on that one. Well I kept having trouble breathing, to the point where it freaked me out so I went to urgent care.

They did BW, a chest x-ray and EKG and found nothing abnormal. He gave me an antibiotic for the phlegm/infection situation and cough syrup. He said that the chest pain and breathing problems are probably from all of the coughing I have been doing.

He also gave me a breathing treatment that helped temporarily, but now I feel the same as I did before. I have no history of asthma, not sure if I have it now.

Well I came home and tried to take a nap, but every time I would doze off, I would jump awake and gasp... like I had not been breathing. It usually knocks me awake right away. I don't know if it's just me not breathing, or my heart stops or what. I wake up gasping for air, with my heart pounding like crazy. I absolutely CANNOT sleep right now more than a couple minutes before I stop breathing.

One thing I should mention is I have a really bad phobia of choking. I can't swallow pills without gripping my husbands hands, it is really bad. Every single time I swallow I have to grip something until it's over. I have had minor anxiety attacks about other things off and on, but nothing this serious. Ever since the fear of choking thing started a few days ago, I have been having SEVERE panic attacks.

Basically my question is do you think the breathing problems could be from anxiety or stress, and not really an aftermath from my being sick?