Panicking,
Don't worry about your courseload. Concentrate instead on the MCAT. I took that dreaded test last April, and during Spring semester I only took 5 credits! I was teaching Ochem and volunteering too, but I took a light courseload to make sure I had time for MCAT study. Especially if your GPA is not so hot (like mine), doing well on the MCAT has to be your top priority!
People will tell you that Adcoms "look down" on not taking a full load, but that hasn't been my experience at all. In fact, the only time it ever came up was when one interviewer congratulated me on my MCAT score, and I thanked him and explained how I had "committed myself to doing well because I knew how important it was." So really, I don't think they care! I'm holdong two acceptances right now, so I think I made the right choice.