When I was teaching engIneering courses, there were students preparing for medical school. Please review the MCAT requirements: General Bio, Physics, General Chemisty,Organic Chemistry, Calculus and English. Once you have physics and calculus, you can take statics and dynamics. I would also see if there is an intro to a biomedical engineering course. This might be a fit between your two skill sets. Some students go to medical school with biomedical engneering background. Take a look at some of these products designed by SolidWorks customers.
http://www.solidworks.com/sw/industr...ufacturing.htm
Many are designed with a team of engineers and doctors. The medical profession has become very technical. I once designed medical devices with the lead engineer and the medical doctor looking over each shoulder giving direction. The medical doctor new the surgical procedure, the engineer new alot about regulatroy materials.
Other advice - don't get behind and be persistant. Any lab based program or engineering program involves intense reading, labs and projects. Get help if you need it as quickly as possible. good luck. Marie