Anything that exists cannot be truth, for that would make it a material thing, which it is not. Truth by definition is "the quality or state of being true." Either something is true or it is false.
I've heard an astrophysist say that there are 10 known dimensions. In my youth I had experimented with psychedelics myself, but I have never experienced anything out of body, or apart from this reality or dimension. But I believe there are probably more than just ten. Yes, Quantum physics, from what I have heard, is quite a startling thing for those who have studied it in depth. I would recommend listening to Chuck Missler on that subject.
As a Christian, I believe we are a triune being, (threefold, having a body, soul and spirit), made in the image of our creator God. And I have never found in my life any more truth than in the gospel of Jesus Christ. I believe this truth has been revealed to me by revelation of the Holy Spirit.
The Holy Spirit "will guide you into all truth" (Jn.16:13). Jesus Christ said, "I am the way, the TRUTH and the life, no one comes to the Father, (God), but through me." And there we have the trinity. Three in one, as we are three in one. Seek, and you will find. And the truth will set you free, my friend. 😊