Pityriasis Rosea, Or Something Else??? Please Help Me.

I am a 21 year old female, and recently I started getting various sized pink spots nearly all over my body. I did notice a slightly larger patch a few weeks ago that reassembled a bug bite. This could have possibly been what is known at the "herald patch," however nothing can be certain. Then not even a week later I noticed another smaller mark underneath my breast.
I tried not let this worry me. I assumed it was eczema because I have had a very small case of it on my ankle, which doesn't even affect me anymore since it was so minor.
Then suddenly out of no where I started waking up with more and more of these pink patches. I started feeling itchy, achy, and then even sick. The spots spread all over my torso, chest, back, neck, and i've even noticed a few blotches on my cheeks! This obviously really concerned me. A friend of mine told me that it was probably just a minor rash, so I bought cortaid, but that didn't seem to help. Then suddenly my neck and chin started burning. This was the final straw for me, as I couldn't even go to school because I felt so damn uncomfortable.
I went to the hospital.
I made the mistake of telling them that I thought it may be a case of pr, which now I realize I shouldn't have so that I could have definitely known what their diagnosis would be. My mother had pr a few years older than me, so I had only assumed since I have a lot of the symptoms.

But the problem is, there are over 1000 different rashes out there that could possibly be considered one in the same.

The doctor prescribed me prednisone.
This was last saturday the 18th. Since then some of the itchiness and acheyiness has gone away, however the spots haven't, and neither has the burning on my neck, chin, and now chest hasn't. I realize that its only been about 4 days since I started the medicine, but shouldn't it be working by now?
My prescription will be over by the end of this week, and I fear that its just not going to be enough. I just don't want this to get worse, and i'm scared. it has made me so unhappy, and feel so self conscious. I have never had any problems with my skin until now. My upper back looks like its covered with tiny zits, while the bottom is clear of them only with the pink spots. I just want it all to stop. As of now my face isn't that bad, its a bit blotchy, but can easily be covered with powder.

I am so scared that maybe this isn't pr, and maybe its something more serious. I've literally tormented myself looking at over 30 different websites on rashes/acne/everything!
Is it normal to experience burning during pityriasis rosea?
Does cortaid really help, or in all actuality does it make things worse?
Has anyone else who has had pr experienced any on their face?

Please, please, please, someone help me. I am literally driving myself crazy with all of this, and I can't seem to focus on anything else.