Raven, I had the same experience with higher doses of Seroquel! It's not just you!

I was flat AND depressed. Didn't like it, so I had to go off the drug. (I wasn't depressed before we upped the dose, either. It happened during titration.)

Probably not the exact answer you're looking for, but yeah... Seroquel can make me depressed, so it's not just you.