You have around a 65% chance of acceptance to one MD program with a GPA of 3.5 and a MCAT of 35. The 5 years of volunteering will look good on your application: most applicants only have 150-200 hours or so. Schools with a service mission like Creighton would probably like that.
I would apply to about 14 low-tier MDs, 3 reach mid-tier MDs, and 3 DO schools that appeal to you. You are a strong candidate for DO: your stats are all great and they would get excited about an applicant with five years of volunteering.