One of the little footnotes or rarely read qualifiers in certifications has to do with now being certified for diving in "conditions similar to those with which the diver has experience" or similar language.
I remember being a little put off by a tech instructor I contacted here in the northeast when I first came up here, who said I'd need to get in 25 northeast ocean dives before taking one of his classes. I had a lot of dives in Florida, Mexico, and Hawaii, with currents, on wrecks, deep, etc.
After my first dive in our conditions, I saw his point.
Now I don't fret going out expecting a bottom temp at 40 or below, with less than 5 foot vis, but it's something you want to build up to. Add a drysuit into the mix you described, with another source of buoyancy to manage, and you get the picture.
Conversely, cold water divers who aren't used to current can go down to Florida and get bitten by that, wrongly thinking that that nice, warm, clear water is pretty benign.
Your experience illustrates very well the need to gradually build up experience with different conditions as you pursue diving. Even a seemingly controlled environment like a quarry can get you into trouble if you get loaded up with too many new things going on at once.
Sorry you had a tough one on your first post-cert dive, but chalk it up to experience, write down the lessons learned in your log, go forward and be safe.