More importantly, 3g is a highly variable dose, and borderline meaningless/misleading, because not all shrooms are the same.

You lose your sense of self. The boundaries between "you" and "the world" fall away and you feel deep connection with everything around you. It's a main feature of psychedelics, and at any dose it is where the "one with the universe" feeling people describe comes from. "Ego death" happens at high enough doses where you *truly* lose the concept of "me" and cannot access your rational mind that knows you are an individual human and all that. You experience "oneness" in a very real and authentic way, and that can be extremely difficult and disturbing for some people depending on how it manifests for them in their trip. It can also be a profoundly beautiful experience that alters you for the better.

This is why setting up your trip is so important for success if you intend to take a larger dose, and your mental state/unresolved issues/whatever can surface in very extreme ways during this if you have not been caring for them or considering them when entering the trip. The OP's description of a trip that kept coming back to themes of suicide, and ultimately ended with a fixation on suicide while losing most knowledge of himself is exactly what I would expect here. It is a really good example of how someone who is dealing with depression should be extremely cautious about self-medicating with psychedelics. I don't know that OP or their GF is depressed, but it sure sounds like one or both of them might be. There's so much out there about LSD/shrooms/MDMA curing depression, but people don't realize those studies that have shown promising results are all done in a highly controlled manner guided by mental health professionals. Taking random shrooms with your buddies or partner or whatever is not the same thing.

Sorry, that turned into a rant...

3.5 is a strong dose that will definitely make you "properly trip", as in it is going to be pretty intense. Going over that starts to chance some next level shit that you 'd better be ready for. I prefer more like 2g for a nice, mellow experience where I still retain my sense of self, functionality, all that good stuff.

After 6+ hours? I usually can sleep fine at that point...