Don't try to understand where the big change would be visible, if it's hormones or receptors or brain structure or whatever. The important things to remember are that for a good number of people a psychedelic as powerful as LSD can change their psychology including perspective/outlook or a better term to use 'paradigm'. It's probably not really visible on any PET, MRI or whatever kind of scan - it's not like you are radically rewired into another person... yet you might never be the same as before (I know I am not). But that can be a good thing! Trust me.
Right now it's all a bit much and very confusing maybe, but you don't have to get a grip on everything immediately. Have some faith and it will come in time. I know something like this can come as a shock but please, don't panic about damage done or something like that. It's not unimaginable to feel like that but it has a tinge of hypochondria to it. I don't mean to get you down, I say that so that perhaps you will look it up if you don't know it and understand that at least a big part of it is your overreaction and that you are in control of your feelings rather than victimized by circumstances.
And I didn't really think you were a troll, I said I didn't. But overreacting can seem similar to it. I don't blame you for feeling or acting the way you are - and frankly IMO no one here should. Why? Because the situation you are in IS a result of converging causality and consequences and it is just the way it is. One of the first things to do for you is to accept that, and feel your influence to choose what happens next.
Damn that paradox of free will ha
edit:
About depression: I said I am okay with what was triggered by my trips and I am, but there are also problems that came with the territory for me personally.
About you: Depression can be what happened, I think that's true, although actual depression is only 'valid' to call as such if it sustains for at least two months or so. It doesn't mean I don't believe you are not feeling okay, you can definitely have depressed or anxious symptoms (okay you're calm right now I see) but for all we know it's only transient, time will tell.
Only you can determine if you need a psychologist to figure stuff out right now, a psychiatrist is probably too much and I don't think medication is a good idea this soon.
With things like LSD latent psychological material / issues come up to the surface. You didn't mention any by name but it's very possible that you are dealing with old pains right now, even if you don't recognize the reason right now. It can benefit you to look into yourself to find that reason and you can come out better than ever. A psychologist might help you with this, though personally I find it pretty soon for anything more than caring for yourself and really giving yourself a chance to get pointed out what is going on.
I guess listen to your body and mind, and do what you feel you need to.