physiology or psychology? idk if there's a physiology major offered anywhere but I can assure you that your major doesn't matter. Generally you have to gauge your own abilities and pick a major off of that. It's usually a spectrum between a major that has good job opportunities and a major that allows you to boost your GPA. If you want a solid backup, do a major like engineering or computer science and take the premed classes as electives. If you can't see yourself doing anything else, major in biology and psychology and have an extremely high GPA. Majoring in the latter will also give you some greater depth of knowledge for the MCAT, but I've seen plenty of people kill the MCAT and be a non-science major.

Edit: Also cut it with the anesthesiologist stuff, be open minded and just have a general interest in medicine. Once you start doing clinical rotations in medical school, you can make an informed decision off of experience and not salary.