It is hard to say because of comorbid eating disorder, as you suggested. Baking cookies at 2AM makes me lean towards yes, brewing hypomania.

This is unrelated, but have you tried moving your schedule to going to bed later, getting up later?

You need to give yourself rest to recover. If you further damage your shin splints and your knee, you may find yourself unable to run at all. Do you have a program of stretching and strength training to recover from your injuries? Do you have a physical therapist?