I'm sorry to hear about your breathing problems

. I also seem to have breathing difficulties that come and go. Mine were usually side effects to all of the meds that I am/was taking - one of the main meds that caused me problems was Lyrica so I had to come off it. I have had an Asthma test but for some reason, we never got the results back.
I agree with Heather and Diana, that I would have a look on the internet or on the drug cards found in most medications to see what the most common side effects are and would also speak to your doctor.
Please keep us updated when you can - I hope you get things sorted soon!
Alison.