Hello Everyone!! on the subject of Peak Flows. I want to get a good quality one. Do I have to have a doctors prescript
ion for it? Or can I buy on like at a drug store? I have not been breathing well last few days ago. I think its my sinus draining again. I don't have good sinuses. Never have. Anyhow, I need some advice. Can anyone help me a little? Id appreciate it. I am 5'8'' 200lbs. Thanks.