I had a panic attack 10 months ago where I was having trouble breathing. I don't get panic attacks anymore, but my breathing issues have persisted.

My breathing issues are, I feel short of breath when completely at rest for no reason. I also feel like I can't take a deep breath, that the air gets stuck in my throat. I have to use a lot of effort to get a deep inhale. And my ribs and stomach feel sore, like they can't expand enough. I feel like I'm just not getting enough air, almost all day everyday. I still try to exercise, though it is very difficult, and I need lots of breaks. I get short of breath sometimes just doing mild household chores. 

I got all types of tests done - all normal except pulmonary function tests show mild asthma, which I've always had. I am so fed up, that I gave in and started 25 mg Zoloft 10 days ago. I upped it to 50 mg today. Not feeling any relief at all.

I can't believe this is anxiety - I don't have any stress, and feels like the breathing thing is causing the anxiety, not the other way around. 

Anybody else feel this way? What has helped you?