I'm on 37.5mg. I still feel the effects though. I went off for about a week, and I thought I was going to fall asleep everywhere I went. I couldn't get up to work out, could barely stay awake in my classes..it was bad. I know you're not supposed to go off cold turkey though so that may be why I had such a problem when I did go off. As soon as I started them again I could tell a difference.
Have you tried to split them in half and take half in the am and half in the pm? But if you're not feeling it, then I don't blame you. Why put yourself through the misery!!