You have become obsessed. Stop looking to see if his car is there or waiting to watch him drive off. Do not hand him a note. Just keep going in there and one day when he is out front ask him for coffee like everyone has suggested. Once a colleague called me at work..we didn't know each other "he said...I don't normally do this type of thing but do you want to have lunch sometime?". I thought that was a nice way of approaching it. You should just call and ask for him...he has to know your name since he fills your scripts. What prescriptions do you take so regularly? It would be pretty funny if you asked him out when picking up birth control lol.