Not just this, but they surround the sessions with intense therapy.
They're not just giving people psychedelics and keeping them calm. Look up the MAPS (a foundation for psychedelic research) protocol. People are given a series of intense therapy sessions, only some of which involve psychedelics.
Sadly, many of the studies fail to have an active control group. That is, they aren't comparing therapy + psychedelics to therapy alone. That's a major pitfall in the current research.
And unfortunately, the therapy component of the research is lost in most internet headlines and articles. People are walking away with the impression that psychedelics are inherently anti-depressant compounds, when the reality is that they're being researched as adjuncts to intense therapy.
However, every time I read about studies into psychedelics, I only ever hear about the upsides and not the potential downsides. I went through a similar experience to you - although not as severe. I had anxiety for about 3 years after my bad trip which luckily gradually reduced over time.
What worries me is that the more these drugs gain credibility in the medical field the more likely it is that depressed kids are going to self-medicate and given the ability of these drugs to multiply the user's existing anxieties, they should be the last people who should be experimenting and self-medicating with them.