Crabby person symptoms and conditions

I have been on pred for 6 days after takin solu medrol dose pack for 6 days for an allergic reaction. The med helped the rash and itch immediatly but as soon as i taper down the rash is back full force. I dont know what to do I cant take the steroids anymore, I am a rotten crabby person on these, i have heart palpitations and sever muscle spasms, it has to be from the steroids. If anyone knows how i can feel better please let me know. I also urinate constantly and only sleep in broke up cycles with wacky dreams..........