My best and most interesting trip was on about 4 to 5 grams, however, since that day, any little amount will send me spiraling into the rabbit hole.

My trips start like yours. Cosmic creation/dark places/scary thoughts, crazy visions, etc. However, if I surrender my fear and accept my physical mortality and come to terms with it, all the negative/dark stuff fades away completely and I have amazingly euphoric and positive experiences. When you start tripping, tell yourself and accept that you are okay to die, and the dark stuff fades away.