Hello bpenniman: Unfortunately we here on PC cannot help you. We can provide support & occasionally some useful advice. But you must help yourself! From what you wrote it does definitely sound as though you've developed an eating disorder. But, whatever it is that is going on with you, you need to seek treatment as soon as possible... right away would be perfect!
You can begin by seeing a general practice doctor, a psychiatrist, or other medical professional. A therapist is another option. But, from what you wrote, I would suggest that the therapist should come later. First you should get in to see a physician.
here are programs that specialize in treating eating disorders. (One I'm familiar with is the Emily Foundation.) If there is an eating disorders program near where you live, you could also contact them. But, however you go about it, please seek treatment as soon as possible. The sooner you begin to address this problem, the easier it is going to be to heal from it. My best wishes to you!