I'm so beeping tired of this pain!!

C
I found out on Fiday that I have a missed miscarriage. My baby's heart stoped beating 3 weeks ago. Sunday I started to have really bad pain and I started to eliminate tissue with almost no bleeding at al. Since Sunday until now  I'm in almost constant pain. The pain killers are not helping anymore. It is hard to walk and I can't do almost anything. I called the hospital but I have to wait until Friday to have a D&C. I don't know anymore how to deal with the pain. It's so bad!! Any tips?