I wonder if the 'weak immune system' with anemia is FIV or FIA? Do you know if they tested for those things?

http://www.vet.cornell.edu/fhc/brochures/fiv.html

http://www.veterinarypartner.com/Content.plx?P=A&A=1692


Whatever the cause is, I hope the meds kick in and bring this kitty back up to full health and soon!!!