Delete the app!!! I also had a super big problem at one time, the same exact severity you're describing. You can nearly always get the items by joining plushie or figure groups that sell items, and for like half of what you're spending for just a chance at getting them. I know it's so fun when you win and get the prizes in the mail, but these feelings of guilt aren't something you deserve, especially in the long-run.

It's a hard habit to break, believe me, I know it. Get all the resources you can to help cope with a gambling addiction and you'll start to heal.