tight chest feeling and alot of dry coughing

its getting really annoying, for the past 2 weeks i've been weezing and having dry cough spells, they have gotten worse. i only sleep around 4 or 5 hrs a night, but usually when i lay down on my back the coughing goes away, but when i get up and move around it gets worse and all day yesterday it felt like someone was standing on my chest all day. i get a rapid heartbeat and shortness of breath, went to the er and they prescribed predisone to me, which i've taken for 3 days, but it seems not to be working. Chest x ray came back fine, and my oxygen levels where at 100% at the time of the visit.

i've really never had any breathing problems before, but i have recently moved to a different town, and now have to deal with 6 animals when i was only around 1 all day. not sure whats going on, but i don't have any sore throat or major sinus issues. just a hard dry cough with nothing coming up. it literally sounds like i'm dying.. i've had alot of stress and anxiety lately since i moved and the job doesn't calm me down either. i just feel so bad and i feel the docs don't understand how bad it is (maybe until i'm laying down dead).