@juliess First, welcome to Mayo Clinic Connect! I, for one, am nodding my head up and down like a little bobble-head doll, reading your words! And there are no doubt many more agreeing with you.

Things that have worked for me?
-Write everything down. Even if it makes no sense at the time. Then go back and look which condition it might be about. Keep notes together.
-Keep medications up-to-date. I don't try to rely on my memory anymore, afraid I will miss something.
-I keep a small calendar in my purse to write things down, but also have a larger planner at home to transfer things into. [I'm a paper and pen person, not a techy person!]
-Diet is a challenge for me, so being aware of what will be best any given day may change. And that's okay.
-Likewise, some days are just a non-starter. No energy or enthusiasm. There will be days like that.
-A biggie is "be gentle on yourself". Don't try to do more than you can. There will be another day we can accomplish things.

I deal with end stage renal disease, an active blood cancer [and it's treatments] plus a few other concerns.

I hope this gives you some ideas? Tell me what you are trying to make sense of in terms of multiple health issues, and how you handle them?
Ginger