Itching

Started taking Treandra on 1/10 & 1/11(2 treatments a month)...already had a small rash in my side...now it progressed to waist, arms, legs...almost everywhere...and VERY ITCHY..notified dr(thru RN).and was perscribed a "med-pac"...I don't know what that's going to accomplish...I also have blood drawn every Weds between the treatments...I DON'T want the treatments to stop but don't know how long I can hold out with the itchy situation..it SEEMS like every time I take a shower, I find MORE rashes on me