To be fair it was tabs of acid rather than anything precisely measured, but it was enough to keep me going for 48 hours. Might have been more, might have been less, but that's really a bit too much.
I'm on the run so can't respond in depth, but check out ototoxic drugs which attack the auditory nerve. SSRIs may not be directly ototoxic but numerous studies have shown that sertraline can cause tinnitus, due to the role that serotonin plays in filtering audio signals. So there are multiple causes of tinnitus, and the impact of SSRIs is partially known but not fully understood.
I developed HPPD in 2017, and I've been seeing unusual things for a bit over 2 years. The HPPD was triggered by dropping on the order of 1000-1400 micrograms of LSD - and for context a reasonable dose was 50 micrograms. This was way too much, and I fried for a few days. I'm not sure when I came down because HPPD decided to show up and it took me a while to realize that the HPPD was, well, persistent.
The effect is pretty minimal - I see faint geometric shapes in the sky, blank walls, monochromatic screens, such like that. When I look at things like pine trees or complex shapes the patterns vanish. The patterns are actually quite pretty, though it gets irritating at times. It's hardly crippling, but maybe I've gotten lucky.
A few months before I developed HPPD, I also developed tinnitus due to a combination of incredibly severe stress, severe life-long depression, and a doctor prescribed high dosage of Zoloft. I got my ears tested and I have perfect hearing in my left and near perfect in my right, so this isn't auditory damage. In contrast to HPPD, tinnitus can be crippling. Tinnitus is a neurological condition so there's no limit on how bad it can get - and when it gets so loud that you can't hear people over the tin, you get pretty desperate.
With both HPPD and tinnitus, the only real treatment is to learn to not let it get to you. As you become more stressed and anxious the symptoms worsen, so if you fixate on it then you'll quite literally drive yourself mad.
HPPD is vaguely frustrating, but I know that it was my actions that caused this. However I'm livid about the tinnitus because it was most likely a legally prescribed drug with known side effects, and doctors hand out scripts for that stuff like it's candy. It's easy to say "oh no, the psychedelics are going to break our brains!" - but doctors regularly prescribe ototoxic drugs, SSRIs that are _incredibly_ habit forming and aren't effective in the long run.
If you don't want HPPD, maybe take it easy on the drugs, but in the grand scheme of thing there are numerous medical practices that are dramatically more damaging than seeing some mildly weird shit.
Happy to answer questions if that would help anyone here.