Here's what changed.
I got rid of the old $5 Venture (remember Venture?) plastic window blinds that were broken and replaced them with on-sale top down, bottom up shades to let in more light. They were a steal at half price.
I bought a sit/stand desk and a mat, (the mat is because standing can be hard on the back and knees).
For the past week, I've been starting my day standing, then I sit for a while, have lunch, go back to standing, then sitting, and so on. I love it. Standing makes it easier for me to move around and I was surprised at how quickly I adjusted to working while on my feet. The mat is big, but it's sturdy, so I can easily lean it against something when I need to switch to sitting.
The cart isn't wonderful, but it's serviceable, and I rarely need to use it, anyway. As long as I have my computer, some pens and paper and a printer, I'm happy. I'm hoping this will also help with creativity, since as I mentioned, movement tends to make me think.
So, that's my experiment...so far.
If you have any great health tips for writers, post them in the comments section. I'd love to hear what other people are doing. (And if you're an author, feel free to promote your book or include a link to your website).
Also, if anyone wants to try this, but isn't ready to go to this extreme, I began by raising my monitor and keyboard using books, boxes and whatever else I could find just to see if this was going to work for me. IKEA also sells a hand crank desk that, at $239, is pretty reasonably priced. I've tried it in the store. It's not bad.