Bethany, how much Dex are you taking? Weight gain and stretch marks, especially purple ones are signs of oversupression.
I myself was depressed and irritable on Dex, even on the lowest dose of .25mg. I'm on Cortef now and I feel much better, but I tend to be tired more often than when on the Dex.
I still weigh more while on steroids, no matter whcih one or what dose. I've been on them too long now, that I'm afraid I'll never be able to get off of them.