I use proventil periodically (5x/month) when I have trouble breat...

I use proventil periodically (5x/month) when I have trouble breathing, typically spurred on by over-extertion, proximity to something that triggers allergy (such as cat). Laterly have suffered from swollen toungue; particularly at night I have trouble swallowing, and when I lie down I feel as if I am going to swallow my tougue. I am not sure if this is linked but doctors can not figure what is causing this swollen toungue. I am taking antihistimine every day (one week so far), but no help.