If the real estate opportunity 'dropped into your lap' it's fine to pursue it, so long as you can explain it well. (Saving for school, working with people during stressful times, allowed flexibility to continue doing medical stuff and volunteering.)
Just don't stop your medical and altruistic volunteering. If anything, ramp them up if you can. You want to show that you haven't 'changed channels' at all and that you're still the dedicated, altruistic humanist you represented yourself to be on your application. In interviews, you'll want to be able to say "I had the most remarkable experience just last week, when I was volunteering at ___"
Also, if worst comes to worst and you don't get in this first cycle, you want to have a stronger app next year. What areas could most benefit from extra effort?