I took the stuff, got up to go outside, then walked a few steps before I started feeling very weak and collapsed. I don't know how long I was lying on the ground but it can't have been long. My girlfriend came out to check on me - I assume because she heard me collapse but it could've just been worry since I hadn't come to bed yet - and found me lying there.She asked me what happened and I told her that I took something, I don't think she realised it was serious at that point. She helped me into the spare bed and sat with me for a while, I started getting nauseous and was clearly pretty out of it she started freaking out about what to do - didn't want to call an ambulance since she'd seen how bad the psych ward was for me last time - saying she didn't want me to go etc. I hated seeing her like that so I made myself throw up a bit.
Anyway I passed out soon afterwards and I guess she thought I might be okay? Apparently a little later I started having seizures while unconscious, gf came in to check on me and saw this so she told my mother who called the ambulance.
There was no permanent damage as far as I know.
50g was too much just because it made it harder to get the stuff down having it be so concentrated, it tasted very salty like drinking seawater. As far as passing in and out of consciousness goes I guess I was too out of it to really worry much, I guess the euphoria from oxygen deprivation probably contributed there.