I once had Divemaster certs from PADI, NAUI, and YMCA, over 400 hours bottom time, certs in Whitewater Rescue, Dive Rescue, Search & Recovery (In water, it's only a "rescue" for the first five minutes), and Evidence Collection & Handling; I was an assistant instructor at university and Divemaster of a county rescue team.
Commercial diving is highly technical; which would appeal to the 'geek' in most of us, and as it is high tech/low relationship (relatively; you still must be able to function as a team, but it's nothing like sales, for instance), I can see a certain Aspie allure.
Having said that, OW I certification is little better than a license to drown, as apparently you've figured out. It's light-years away from a commercial cert. If I were you, I'd get NAUI OW II & Rescue, and all the bottom time you can possibly accumulate; it's not the snort of seawater, but the ensuing panic which will kill you. The only answer to that is training and experience; lots of it.
Another thing; if you're claustrophobic or anxious in low/no light or visibility, commercial diving's probably not for you.
Good luck!