Your path is very similar to mine. I had this experience on LSD, and on the way back - when my ego was slowly rebuilt - I became so frightened (spiritually) at the utter profundity of what I just experienced that I put into place all these blocks and hindrances on the way out which made it impossible for me to gain access to the spiritual worlds ever since. I have this feeling that one day, DMT will provide me with the key with which I can reopen the kingdom, but that will happen only when I grow up to the level where I am ready to face withinity again.