When Trying To Sleep At Night I Have Developed Insomnia

When trying to sleep at night I have developed insomnia I get short of breath and start getting some type panic attack where I have to get up going on approx. 3 sleep in 2 days. NOTE I Cannot breath out nose very good and not a mouth breather . I am asthmatic but haven't had an attack sense child hood. Can Claritin D cause anxiety. Help appreciated.

Male 56 years old pretty good health