I'd do like to point out to you and johannes kreisler that it probably wasn't the LSD that brought up this evil, but only your mind. The difference in these 2 is that when saying LSD did it, you put the blame on the drug, while in reality it is you who is to blame. Like Thou said "just don't a fucking ten strip", unless you really know what you are doing and the situation is PERFECT and nothing short of it. I'm sure you realize this, just felt like it was worth mentioning. When processing the experience, the 2 different approaches will make all the difference.
P.S I've been having both on and off problems with depression and derealization* and saying derealization is worse than depression is just bad. First of all, you can't really compare mental issues, they are relative. To you depression might seem light, but to me getting up and living daily, consumeristic life closely mirrors what one has to go through in the heavier parts of a trip. Secondly, depression can be a starting point for other mental issues like drug abuse, agoraphobia and yes, derealization.
*The latter of these is self-diagnosed and has fully gone away when I got a greater insight in the workings of psychedelics, on which I was basing the feeling. This might not be true derealization, but the time I was having troubles with this is a total haze for me now and I can't really describe what it all felt like. I might have been on the edge of psychosis there.
sure it's all in my mind. but I never ever ingested a drug or combination with the potential to send me to those places in my mind...or 'the mind' that is.... (truth to be said: I had this catastrophic trip after a one week binge on all kinds of psychoactives. surely did I fuck it up.)
lsd is a brutal and ruthless teacher. if you don't comply it will just break you. no mercy.
sure it taught me what I needed to be taught. but the way it does is just by brute force. difficult to ingest. actually sink or swim...
I don't put the blame on the drug. I don't even judge it or think little about it. but I'm still convinced that lsd can send you to actual hell - like no other drug (I know) can.
I've had trips on smoked DMT+MAOI+n2o that sent me way further down the rabbit hole (face of good, who is me, who is everything, swimming in the fountain and being reborn from it for eternity; "the other side" actual paradise; stuff like that

) and there was just no sinister touch about that. it's just not present in that compound. I've had rough trips on DMT but they never tortured my soul, with the pure intent to destroy and disintegrate like lsd did.
maybe lsd is the western approach to psychedelic enlightenment. the fascist of psychedelics. power is indeed power and it's message is valid as it reflects an aspect of the human condition. but it tries to deliver it by means of force and not by means of love.
and btw: I know very, very well what major depression is. it's been my best friend and worst enemy for over 10 years now. and I still say that derealization feels worse.

this "edge of psychosis"-feeling is the worst thing I've ever felt. for days it was like a permanent bad trip. it's not the usual major depression mindfuck of "oh, I think I'm going insane" ( - while secretely hoping to go insane to get rid of all obligations..

), it's the permanent feeling that your soul&mind are in a process of disintegration and that complete meltdown is imminent. NOT fun. learned a lot from that episode. ....let the shadow flow through you and it will disappear...