This is maybe a kind of out-there suggestion, but I have a friend who deals with chronic low-level inflammation and was diagnosed as pre-diabetic 6 months ago, despite generally taking care of herself. She recently started a new paleo-esq diet aimed at people with auto-immune disorders (specifically developed by the author to treat their MS) called the Whals Protocol, and loves it. She says she has lost some weight and is generally feeling much better/alert/energetic/etc. She should be getting news soon about how her other health stats are doing, but she says she feels great.
If nothing that conventional medicine has to offer is helping, it might be worth checking out what they have to say. I know these kinds of ailments can be insanely frustrating to deal with and everyone and their mom has something that someone they heard of once tried that instantly cured all pain, and it's a lot to dig through.
As someone with a semi-similar background (ecology, field work experience, wrist pain if I don't take care of myself, sick of being 'poor', but no other health issues), I can personally recommend a few things:
1. I am not always great about it, but I limit time on the computer as much as possible. (What, browsing the MMM forum counts!)
2. I try to identify specific actions/tasks that cause more pain. For me, it is extensive use of a traditional mouse, and poor keyboard/wrist/arm positioning, and working on a computer in bed. Solutions involve not working in bed, being anal about keeping my elbows at no less than a 90 degree angle when working on a computer, and learning every keyboard shortcut I can. I have also in the past used non-standard mice like drawing tablet + pen, etc.
3. I am out of the habit, but a temporary fix can sometimes involve sleeping in a basic wrist brace. Without it, I curl my wrists sharply when I sleep, so sleeping in the brace can give them a break. I got one with a metal shank in it from Amazon for my mouse hand. This is the brace I use:
wrist braceAs for the environmental jobs with less computer work, I am going to be Debbie Downer and confess that I got out of environmental work b/c it didn't pay well enough with the experience I had and my qualifications for consulting work weren't as good as yours, so I career-switched and am now making 25k more than I was as a technician doing tech/programming. :P With your GIS experience, it sounds like you should hopefully be able to aim at the higher-paying end of environmental work! But you'd know better than me what you options there are. I think decent/well-paying jobs without computer/desk work are hard to come by. But mostly they should be less onerous than filling out government job applications! Those things are brutal!