I have been taking Prednisone for 26 days now. I started out wit...

I have been taking Prednisone for 26 days now. I started out with Poison Ivy. My DR put me on 60mg for 2 days, 50mg for 2day, etc. At about day 5, my poison ivy started to resurface & spread. I ended up in the ER on my last day of the original prescription. During those days I didn't really experience many side effects. However, after my ER visit they put me on 60mg for 10days, 50mg for 5 days, 40mg for 3 days, 30mg for 3 days, 20mg for 3 days, 10mg for 3days. Now I have experienced really bad acne on my chest, back, & now my face. (I've never had a problem w/acne before) I understand that is a side effect of the drug and figure it will go away next Saturday when I'm done with all of this. I've also had the insomnia, dizziness, blurred vision, manic episodes, and mood swings. The question I do have is that I have extreme swelling in both of my knees. It gets so bad at times I can hardly walk because I can't bend my legs. Has anyone else experience that?