Two things to consider, maybe you already have...
I'm pretty heavily invested in psychedelic therapy companies based on the Canada exchange right now, veterans and folks dealing with extreme clinical depression are usually great candidates to get some early access testing, i'd do some googling around to see if there is one you'd consider trialing.
Alkaline diets might help alot, I personally know people who have heavily reduced symptoms and in some cases cured life threatening illnesses by going to alkaline diet(heavily juiced vegetables, low/no meat, certain fruits)....
https://www.healthline.com/nutrition...yth#what-it-is
Here is an article critical of the diet, I don't disagree with what they say, but then again, if science doesn't spend money to prove something, does that mean it doesn't work? Don't know as I am relatively healthy and have not had a need to consider a diet like this, but if I felt terminally ill I would consider some alternative options. From associates and family members that have gone through the ringer on conventional medicine, sometimes it just makes you feel worse to follow their regimes.
Not medical or therapy advice, I am not a professional, just some options that might be worth exploring.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3148612/
https://maps.org/participate/participate-in-research