What parts of the grocery game do you enjoy, and what drives you nuts? What would you do with your extra time if you don't do the grocery game? Can you focus on the part you like and figure out an easier way to do the stuff you don't? E.g., if you want an excuse to go for a walk at lunch, then why not keep doing what you're doing to get a great deal? But then limit your weekly shopping trips to a single store vs. chasing the most deals at multiple stores, and enjoy a little extra time with your family, or doing something else productive (researching cheaper cell phones/insurance/etc., cutting off old recurring subscriptions you don't use, etc.).
I would also suggest cutting back on the pressure you put on yourself to plan around the best deals everywhere. Yes, that is a great habit to be in. But it sounds like you have a lot of other pressures in your life, and that those have gotten worse lately (more time at work, more medical demands from the seniors). That sucks away your mental bandwidth, so that stuff that has been easy (or at least manageable) in the past suddenly seems impossible. And when that happens, you need to listen to what your body is telling you. Each of us can handle only so much shit at one time, and so when one turdball grows beyond control, you need to find a way to cut back on another turdball so they both still fit in the available space. Really, it's awesome when you can find asparagus for $0.97/lb, but the world will not end if you miss the sale and go without asparagus entirely -- no matter how cheap it is -- because you've decided you're going to eat out of your freezer this week instead of dealing with all the shopping.
Finally, are you doing ok? One of things I've noticed is that when big scary things are happening, it becomes super-easy to over-focus on the trivial and meaningless, because it allows you to feel in control of something (even when that something doesn't actually matter). So it may be that your fretting about the grocery game isn't really about the groceries or the money after all (a/k/a "it's not about the tortillas"). Worth thinking about at least.
IOW, don't let the perfect be the enemy of the good. Figure out for yourself what you consider to be "good enough," and let go of the rest until the rest of your life lightens up a bit. And in the meantime, be kind to yourself. You've worked hard and saved hard, and that has you at a point where you do not need to make the most financially optimal decision at all times and at all costs. As long as you're staying within what you can afford overall, it's ok to lighten up a bit on the grocery effort while you adjust to all the other crap happening in your life.