This is good advice. I had an implant post hole screwed into my jaw a few months ago. During the initial consultation I honestly explained I get anxious and asked about what kind of drugs I could get. The dentist was literally like "oh we usually prescribe what I like to call 'happy pills'" which turned out to be some kind of benzos. I also asked for nitrous. It was a total non-event, I don't remember it at all, and experienced no pain (that I can remember). Also the initial local anesthetic shot you get in the gums is about 50x worse mentally than physically. It hurts way less than when e.g., you bite down hard on a sideways tortilla chip fragment and it gets jammed up into your gums.
So just be honest, ask for meds, and be proud that you're taking care of your health and your anxiety.
Imo it's probably not a good idea for another single entity to hold a copy of IA's corpus. IA already operates on a shoestring but it still is expensive and labor intensive to operate, which requires an endowment or constant source of funding, both of which come with political entanglements. I just don't think one org can be indefinite custodians of something so valuable.
A distributed technical solution may eventually be developed which enabled regular people to participate in storing and maintaining the corpus. I think IPFS was supposed to be this kind of solution but seems like the tech isn't capable or mature enough (Anna's archive abandoned IPFS for technical reasons and that's a far smaller corpus). BTW IA has engagement with the dweb community and are interested in finding distributed solutions for storage of IA's corpus.