RSD again?

I have had RSD that is located in my right lower abdominal area that spreads around to my back, down my buttocks and sometimes to my right leg.  I have heard that RSD may be treatable if caught in its first stage.  Unfortuantely, it took over five years to find out I had RSD. 

I also have Picks disease which is a fatal degenerative brain disease that causes many strange neurological symptoms.  Last week, I had a terrible itching spell.  We tried many ointments and sprays but it didn't go away until I took some Keppra and Namenda which are used for my pain condition and neurological problems.  Well I scratched with my fingernails under my left breast.  One of my fingernaials had a jagged edge and it caused s superficial scrape about 4 inches long.  Within two days, I started having pain in my entire breast, left shoulder and part of my right arm. 

There is no signs of injury except for a reddish mark where I scraped the skin.  I am going to my PCP on monday so he can do a work up to see if there is no infection.  I have had so many episodes of pain that no one can figure out the cause of. 

Because of my history, I am worried that I could possbily be developing RSD in that area.  We had to move for my husband to get another job and we have to fly to see my pain doctor.  I talked to him on the phone and he said to have a work up done by my PCP which I am going today as I said above.  He told me also that I could be developoing singles.  He said if the work up is negative, then I should fly out to see him.

I am so worried.  Unfortunately, especially in my nipple area there are a lot of nerve endings so this pain is terrible.  I have throbbing and stabing pain in that area as I do with my original RSD location but I also have this really uncomfortable burning stinging sensation. 

Has anyone had a similar experience?  Could this actually be RSD?

Thanks