Haven't left the house in 3 days....depression, bulimia, substance abuse, suicidal thoughts?

I haven't left my house in about 3 days, almost 4. I think the last time was the 27th, after I returned from a family Christmas get together trip, to go to the laundromat and maybe Walgreens, and then back home. I have binged 2 times and mini binged 1 time since then, and purged all three times by taking 20-25 Correctol laxative tablets + 0-8 Ex Lax Maximum Strength laxative tablets + 0-10 oz. magnesium citrate saline laxative, accompanied by 3 or more hours after the binge but never later at night than 12am. I went to bed usually within a few hours of taking all of the laxatives, and had violent diarrhea, strong urges to use the toilet, abdominal cramping, bloating, and sometimes vomiting, for up to 8 hours after waking up. I might take 2-6 diuretic capsules with directions to take 2 in one dose, no more than 3 doses per day, later on in the morning or early afternoon. I have been smoking about 3/4 of marijuana per week with a gl pipe, and occasionally taking 0.5-2.5mg Klonopin. Continuing to take 200mg Trazadone per night for sleep. Avoiding social contact, haven't been leaving the house, feelings of worthlessness, helplessness, feeling like I can't do anything right. It takes me a very long time to do any small task. I am currently prescribed 100mg Pristiq/day, 30mg Vyvanse/day (but I sometimes either don't take it or take 60mg), 0.5mg Klonopin as needed, and Ortho Tri Cyclen Lo birth control. I feel like my life is completely pointless, I am useless, a waste of space. I can't get myself to leave the house.