Well Xroads, unless you are in the late stages of terminal cancer or are in labour, I can't see why you particularly need Demerol. If you were in such a physical state that you need that kind of analgesia you would probably already be in hospital.
A Pharmacist would have given you suitable advice if you had presented with with severe pain, (even if it was only to tell you to see your GP as soon as possible). Also, the first thing a trainee would have been taught would be to refer you to the Pharmacist if they were not able to advise you.
I am sorry that I have not taken you seriously but you see I, and most people that work with drugs, have seen and heard it all and I am afraid that you come across as typical of what we have all dealt with before.
I have to ask you, why, if you really are genuine, are you not seeking treatment from your GP? After all, that would be the usual course of action for most people in pain.