What is it about the work that makes you drag your feet? Perhaps there's still wiggle room - for example, if it's just the idea of seeking out grants the rest of your life, maybe you could shift over toward a tenure track.
I think the big cutoff point is whether this is work you could conceivably see yourself doing for the rest of your life. If the answer to that is yes, then figure out what you can do to make certain your life doesn't get sucked into the job, and figure out some outside interests that will help you feel fulfilled (as Rob suggests).
If the answer to that is no, then -- grad student or no -- find a way to change tracks ASAP. It's either going to be moderately painful now or really painful later.
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I think the big cutoff point is whether this is work you could conceivably see yourself doing for the rest of your life. If the answer to that is yes, then figure out what you can do to make certain your life doesn't get sucked into the job, and figure out some outside interests that will help you feel fulfilled (as Rob suggests).
If the answer to that is no, then -- grad student or no -- find a way to change tracks ASAP. It's either going to be moderately painful now or really painful later.