As a general rule to qualify for a waiver you need to demonstrate a couple of different things. One is a history of no contact, and…no money. Since you have received child support recently, I believe it will be very difficult to argue that the NCP will not contribute or that you can’t track him down to fill out the form.
You can try but I doubt you will qualify for a waiver in my personal opinion, I am truly sorry to say that.
I agree with everyone else, if the plan is med school you want zero debt for undergrad.