Many things in this business are out of your control, but time is one over which you have power. Time-management determines three incredibly important things: how much money you make, how consistently you make it, and whether or not you burn out.
In camming, you get to be your own boss. What kind of boss are you going to be? A good boss is committed to physical and mental health. Be your own best boss, because nothing is more important than your health.
You know how the great thing about camming is you get to be your own boss? Be the best damned boss you can be for yourself. First and foremost: figure out what you're willing to do and for how much, then don't waver.