I think the simplest solution for the OP is this.. embrace uncertainty. I can't really offer a step-by-step guide on how to do so.. everyone's pathway is slightly different, but I suppose that should go unsaid.
Sometimes an endless quest for the 'truth'- or answers- is the answer in of itself. It at least allows room for growth, and really, that [for me], is a driving force in my life. Growth. I may not always know the definitive why's and how's. Or if ultimate, objective truth even exists at all. But if I'm questioning, and searching, then odds are high that I'm moving forward. I've learned to apply what I do 'know'- and what I do not know- to my own set of subjective values, and continually make alterations the more I learn, and don't find making these adjustments distressing. I've let go of certain expectations. Intrinsic meaning is subjective for me, and subject to change in some ways from time to time. It's like continually getting a new set of contact lenses to accomodate my evolving vision. Sometimes the transition is uncomfortable, blurred.. but even then, ultimately, I still feel closer to pure clarity with every shift [though I still don't know what perfect vision actually looks like]. The already vast horizon line stretches further back with each new turn of my scope; sometimes it's spread out so far ahead of me that it's beyond sight, but I know it's still out there.. Instead of feeling like I'm wandering around lost at that point, I welcome the new free space, and start running faster. It's all connected, so every direction in this new space is forward in some way.
This viewpoint has sort of helped me live in the present moment moreso than I had before. I'm actually able to focus on setting down the foundations for all those castles I've already built up in that infinite upper atmosphere. It's freed my mind from a lot of worry.
I'm rambling now; I hope to some degree this makes sense to you.