Severe Depression when Dexedrine IR wears off.

[Twiggy]

I experience a very depressed state of mind when ever Dexedrine wears off (after 3.5 hours of positive effects).
The depression lasts a few hours, but it feels horrible.
I can't smile or think of anything happy. I don't feel like talking to anyone and people have commented on my frowning face.

That is the only side effect I get from Dexedrine. I don't feel anxious on it.

I'm usually a happy-go-lucky person.

I've tried Ritalin IR, but it gives me a lot more physical anxiety (feeling my heart pounding, feeling uncomfortable being in my own skin from the anxiety, etc).
The only thing is that Ritalin IR doesn't make me feel depressed when it wears off. I only feel overly anxious.

What can help? Any input is greatly appreciated.

By the way, I only take half of a 5mg tablet to a whole 5mg tablet per dose.