Hi I too live in constant pain,along with my mental health problems I have ME, arthritis and fibromyalgia topped off with a mini stroke back in January.
I totally understand when you say you don't want to live with the pain anymore but like me we have our children as our protective factors.
As much as we want it all to end we could never do that to the kids.
Not a day goes by that I think about ending it, but you can't, some days your stronger than others and sometimes you just get so fed up of living an existence not a life.
Don't give up you've come this far, your stronger than you think

Take care

J