I'm no plumber but the garbage disposal is for food, the toilet is for food we ate so I guess it makes no difference which end it is coming from. I doubt it would do anything to your sump pump, too. Just my assumption it is from the weather. A plumber can correct me if I am wrong.
Good luck, I hope you find the strength in overcoming your purging. As I am sure you are fully aware of, this is going to ruin your own pipes or worse.
...great strength comes from faith in God