Unfortunately, Panda Bear is right... once matriculated it is very difficult to transfer, and then it is usually only possible after the SECOND year, which provides for discrepancies between schools curricula in the first two years. Also, you need a VERY GOOD reason to transfer, especially if you want to get into a California school. "I'm not happy at my current school," is generally not enough... they are looking for more solid reasons, such as a spouse that's back home, etc. Your best bet is to give your school a chance. More than likely it will just take you a little time to get readjusted to a new environment. If not, then you must question your priorities, and how important medical school/medicine is to you vs. being close to your family. One thing I would NOT recommend is to drop out of your current school and then reapply... once someone has matriculated and then drops out (whether it be that they left on their own accord, even if their grades were good, or were asked to leave), they have virtually NO chance of being accepted somewhere else... all other medical schools will think of you as a gamble and likely will choose other applicants over you in this scenario.
Hope this clears some of this up. Best of luck...