hi, i,m new to this site. Just started suffering from anxiety and stress attacks. I have known nothing like this, feeling lightheadiness and legs like jelly. Dr precribed Propranolol. Took one last night and felt ok but could'nt sleep all night. Dr precribed 40mg twice a day. Rang an emergency dr today and he said it would take two weeks to kick into my system, my own dr did'nt mention this. My own dr said just take them when you feel stressed, but the emergency doc said take two for two weeks to kick in, then see your dr. Does anybody know when i will start feeling better, as at the moment i can,t eat or sleep. Thanks for any advice.