Of course it is ideally better to be under the care of a physician, but I guess there are many people who are not. Take a look at Notdoneyet's posting in the regimens section.
Things seem to be very different in the States compared to our British system and many more doctors are not willing to stick their necks out. Well, that is the case here as well, but less so. Also, as I have learnt over the last few months, many people don't have medical insurance, so what are they supposed to do? Not a lot of chance of getting it after an MS diagnosis, I would have thought. I am so very lucky in this respect, having David as a husband, and having a GP who will prescribe whatever I ask for. Also we have the NHS, of course, so aren't reliant upon insurance.
For these reasons I can't call you careless or stupid. Since you have your wife and children to think of, I can't imagine that you are would do anything completely foolhardy. You know that if you don't have a physician looking over you, you do at least have someone to whom you can write.
Best wishes for when you start the metronidizole, but don't rush it: hopefully you will sail through it, but it even makes my GP want to throw up.