[Serious] Euthanasia for Mental Illness

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I'm not suffering from a terminal illness, but I have been given the "there's nothing else we can do" diagnosis from my 4th neurologist pertaining to the Idiopathic Poly Neuropathy in my feet, hands, and legs. This is in addition to the Osteoarthritis in my knees, hips, neck, and lower back.
It's why I was forced to retire on permanent disability in 2015, and why I suffer from chronic, daily pain and numbness. Sometimes, just getting up from my chair can become an adventure.

Even if it's not legal here in Washington state, when I make the decision that I'm no longer able to tolerate it, if/when I'm no longer able to walk, and my quality of life has run out for myself, I know that I'll make that decision and carry it out, alone.
I'm already maxed out on my prescription meds for the nerve pain, and my doctor told me that it's only going to get worse and would never improve. Pretty grim outlook, but this is what's been handed to me.
I'm basically just living to hopefully see all 4 of our grandkids grow up. Our oldest is 15, and the youngest is 4 now.Just taking it day by day. I'm currently taking 2 antidepressants, and several other prescription medications, and have been suicidal off and on for several years now. Some days are okay, and some days fucking suck, and it takes a toll on me mentally, as well as physically.

When I decide the time has come (quality<<< quantity) and assuming I still have my mental faculties I also have a painless end-time plan.

No, it does not involve a firearm, just in case anyone is wondering.

I know (or have known) people in a similar situation as yours. You have my sympathies.

Edit: An additional thought, have you asked the neurologist(s) if there are any clinical trials for your chronic pain that you may be eligible for? i.e.: https://classic.clinicaltrials.gov/ct2/show/NCT00156689