Your PS should be about three main things. this could sometimes be stretched to 4 but Ill just talk about three
1. Your background simply talking about who you. DONT be fancy but dont kill the reader either
2. your experience in the medical field and why you are choosing to pursue it
3. What you did differently to make yourself more competitive since you are a reapplicant
Theres tons of info on here and online for reapplicants needing help with personal statements. Google search it.
Theres a person Drmidlife or Drmiddlife who posts alot in the reapplicant forum and he (or she) gives GREAT advice