MGG,
You are not alone! Look at all the articles on med schood student health anxiety!!
http://www.ncbi.nlm.nih.gov/pubmed/15107081
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2267854/
http://www.medhelp.org/posts/Anxiety/How-to-cope-with-hypochondria-medical-students-syndrome/show/1186462
I would have a REAL problem reading/learning about all the medical issues that you deal with!
Might it help for you to talk with other students experiencing the same thing? Or even a professor?
S.C.