I've tripped bad twice in my life, as well.

Once was my first hit on a bowl of 20x salvia. Existance all got sucked through the head of a needle and a dark forrest rose up all around me, and I was all alone in a forest of evil for about ten minutes.

The second time was off of my first knifer. I put the biggest nug I could find on the knife because I thought my friends were bullshitting me on how intense knifers could be. After I took the hit it was like a roller coaster. The whole house blew away and I was falling down into a deep chasm full of screaming, burning people. There were huge swirling tornado pillars everywhere consisting of skulls and black foggish clouds. I clamped my head with my hands and fell backwards into the wall, then onto the floor.

Fortunately, those trips were over within a few minutes. And I intend on sketching out that vivid vision I saw, since everyone trips out when I tell them what I saw and we can laugh about it now. Sorry yours lasted so long.