I am on a 6 day treatment of PredniSONE 4mg for a foot injury tha...

I am on a 6 day treatment of PredniSONE 4mg for a foot injury that caused massive swelling. The swelling was gone after the first day of the treatment, but the side effects started the second day for me. I freaked out yesterday thinking that I was having a heart attack. I even asked the doctor if there were any weird side effects and told him that I have anxiety about taking medicine. He said it's harmless, and not to worry. I felt safe taking it the first day but now I've been experiencing increased heart rate, flushed face, pain in my muscles, left arm, and chest, tingling and itching, I can't sleep, when I do sleep in the morning I wake up tense and frustrated, I've lost my appetite, it's hard to go to the bathroom and I can't seem to get my thoughts together. I had an anxiety disorder before and had I known the side effects of this medicine I would not have taken it. Today I decided to skip a day by only taking three pills today and two tomorrow. I just want OFF THIS STUFF!!! and I never want to take it again. I can't believe its on the market and doctors are soo shady about it! And all this from the lowest dose... 4mg.