Carol,
When I read your post I think I could have written the exact same thing about my Dad. Even the doctor telling him he'd see improvement in 2 to 3 weeks. When we didn't see improvement and it actually got worse we questioned the doctor and the doctor kind of back tracked and said well it actually takes a few months for significant improvement. I know how hard this is for both of you but hang in there, don't give up, this will get better.
Robin