After trying out my new BCD in a pool, and having never used my new computer (I read the manual), I added a bunch of new equipment (backup knife, safety tube, whistle, etc.) to my usual setup the night before a dive with seals (first dive of the year). I was up late doing it, and up early to pack and leave.
Halfway through the hour drive to Gloucester, I realized I had forgotten my weight belt, and worse had forgotten how much weight was on it. I was running late, so couldn't go back for it, and arrived at the boat stressed out. I put a new weight belt together by fastening two shorter belts together and ballparking what I would need. I wasn't happy about it, but had no one else to blame.
We got close to the site, and I started getting into my 7mil two piece wetsuit, and was told I was "brave" for not wearing a drysuit by at least 3 other divers. I knew I was used to it, but it added to my stress. Two other wet suit divers offered to buddy up as a threesome.
I pinched my finger in my drybox as I got the last of my gear ready, and they both entered the water as I was getting the blood to clot. When I finished my equipment check (sans buddies) I entered the water, got the "OK" from both buddies, and struggled underweighted to descend while they slipped from view in the 10' vis. They didn't resurface to check on me.
I got some more weight from the boat, and decided to descend solo in the hope that they were waiting down the anchor line. I saw a seal swim by, but they were nowhere in sight.
I tried to get my camera out of my pocket, but being unfamiliar with the BCD, I couldn't find the velcro flap, and dropped my flashlight when I finally got it open. Meanwhile, the safety tube that I put next to my inflator kept bobbing in front of my face, the backup knife's placement made it difficult to get to my bouyancy controls, and I realized just how unfamiliar I was with my computer.
On top of all that, the sea was surging with 3' pulses, and the bottom temp was a cheek reddening 38 degrees. Fortunately, I was right about my exposure protection, and was comfortable.
With so many stress factors building, I aborted the dive after about 15 minutes and returned to the boat. It wasn't a "good" dive, but I learned a lot in those 15 minutes. I did see a seal too, which was pretty cool.