Ongoing anxiety and panic attacks

Iam a 50 year old.male .I have had anxiety attack on and off on a regular basis .They always follow the same pattern .I go to bed ,suddenly a horrible feeling comes over me ,I can't breath feel like the walls are closing in and iam suffocating ,I have to get up and run outside and go for a walk to calm down whatever the weather .Now this is happening numerous times a week ,even when I go for a walk ,as soon as I come home it starts again feeling of claustrphobia .I can't relax or sleep don't know what to do .Dr told me to try propranol and see how it goes