@Nikki7 , we found adenosylB12 was off the menu for quite a while - even a small amount induced nausea. We also had to go very slowly with carnitine because it induced (more) fatigue. We still can't really manage carnitine l-fumarate.
Some of the others here had to take things very slowly - @Sushi @caledonia @ahmo ? Maybe they have some ideas about how you might take things a bit more slowly.
You're not taking high-dose B1 or B2 are you? Too much B1 seems to cause a bit of potassium thirst for us, and others have reported the same thing for B2.
@Nikki7 I have a document called Start Low and Go Slow in my signature link with tips for starting small and working up if tolerated. My suggestion would be to stop and let everything clear out, then restart at a much lower dose so you can handle the potassium requirements.
I'm only doing 20mcg of methylcobalamin, 4 mcg adenosyl and 1mcg folate and even that tiny of an amount required 3000mg of potassium per day. I've been able to reduce to 50mg of potassium after 3-4 years. I haven't been able to increase B12 or folate so far.
I use Now brand potassium gluconate dissolved in water and drunk four times a day. Splitting up the doses allows you to absorb more.