I've been on prednisone for a few months now for severe ulcerativ...

I've been on prednisone for a few months now for severe ulcerative colitis, I'm 18 years old now, and the disease started when I was fourteen. So far, it's the only thing that seems to work. I've experinced increased acne, and occasional soreness in my shoulders in back. But the worst thing is that lately I've been just explosively angry. I raise my voice to the point that I am screaming my lungs out (which I rarely did before). I feel like I'm losing the ability to see what's going on when I get angry. I hate depending on other people to know when I'm out of control, but I'm beginning to think I can no longer tell. Does anyone else feel this way? Thanks.