Wow, can I ever relate to THAT!
This is a big problem for me. Always has been. Part of it is being bad at prioritizing. If I manage to prioritize, my follow-through sucks. It is frustratingly often that I want things that are in conflict with each other, or even mutually exclusive. Talk about a paralyzing loop!

I know black and white thinking is talked about a lot. My bigger problem is excessive gray thinking. I can see and understand from myriad views. While this is great for diplomacy, it sucks for decision-making! (Especially when they're swirling around and around on a loop. That I can't prioritize. Argh!)

Making a pro and con list. Sigh. They will either come out basically balancing each other out, or given factors will feel like apples and oranges, or I simply don't know in what sense to consider something. Everything's in flux and interconnecting. And I can't catch them enough to even be able to explain.

What makes me queen of waffling though? "IT DEPENDS". Among other things, it makes forms a NIGHTMARE.

Throw consideration of mood swings into this? Totally incapacitating.

Sorry to not really have advice, but having this problem to the nth degree, can assure you that I totally get it and that you are not alone.