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You need to get better at the administration side of your business pronto. What's getting you down is that you are apparently unable to control the relationship with your customers, both financially and with respect to the scope and definition of the work and that can become a real drag.

Once you have that under control I think you're ready for a re-evaluation of being burnt out or not. When I work real hard and don't get paid I feel miserable, when I work real hard and money flows in to my bank account I feel a lot better. Ditto for working really hard and seeing the work discarded or re-done several times. Inefficiencies like that can really get you down as well.

Being burnt out goes quite a bit deeper than this.