I'm pretty sure the OP is confused and mixing up his doses. I have taken 10mg+ alprazolam in a day. I have consumed 20mg clonazepam in a day, I have consumed 250mg Diazepam in one day. But to take 10mg alprazolam plus 25mg clonazepam plus 15mg (okay, so admittedly that isn't much Valium) in one day just doesn't seem possible? Do you mean you added .25mg clonazepam and 15mg diazepam to your usual 10mgs of Xanax? If so I'm not surprised you didn't feel anything. If you're already taking 10mg of alprazolam a day .25mg clon + 15mg diaz isn't going to really make a fucking difference. But if you normally take 10mg Xanax a day and add 25mg clon and 15mg diaz you are dead. You do realize that would be roughly 400% your normal benzo dosage?
I've been where I think you are. I used to eat 30mg etizolam just to catch a buzz, I used to need 150mg diazepam minimum to feel anything, 250mg diazepam to get high.
Now I get high when I take 6mg clonazepam or alprazolam. I know you don't want to hear this, but if you keep those doses up the magic won't ever come back again. If you weren't mistaken earlier you need to start a medically supervised detox. If you're dosing 1/4 what you claimed in your original post (I'm not calling you a liar, it's just that...) then you need to start taking one less bar every third day or something. The magic can and will come back if you do this. But you will have to go through some benzo WD, which is a fuckin bitch. And you'll have to wait once the WDs are over, or it'll all be for nothing.
I seriously wish you the best of luck.