Sorry to hear about your neck/foot and I hope you get some relief from the chiropractic treatment. The hypothesis seems worth exploring. Yes, everything is connected, one balance can lead to another and stress plays a role too. Please update us on how your treatment goes.
I had a nervous stomach as a kid and frequently woke feeling nauseous. I didn't do anything for it, just lived with it. In the 90s (while on meds) I had a bad stomach for several months and took a medication that might have helped a little or maybe not at all I don't remember. Eventually the issue just resolved on it's own. Beyond that the only stomach issues I've had were in the very beginning of withdrawal and the current episode. I'd be interested in trying ginger if the current episode flares but it seems (?) like things are heading in the right direction.
Thanks for your sympathies about my recent injury. It's true that its part of cycling and I've made it a point to be aware of safety issues and do what I can to reduce the risk. The story is a little embarrassing. I wasn't screaming down a hill on my road bike or doing anything spectacular. I was showing my son how to do a wheelie on a bike that wasn't suited for it and fell *hard* of the back. My ribs are still tender but my leg is healing faster than I thought it would. No more wheelies for me...