Aozger...I have only one further question to ask...have you gotten wet yet since the first posting on this thread? If not, I would encourage you to do so.
Take many of the comments with a grain of salt, and a smile.
We all make mistakes, and it can come at any time in a diving "career." I've seen an experienced USAF pararescuemen on a simulated Apollo parascuba jump make the jump without his swim fins! Embarrassing before NASA and the whole world, but he simply completed his tasks without them.
Diving is a fun sport, and half the fun is being weightless. So that bit about buoyancy control is important. But I had many years under my belt when I tried using a dry suit for the first time, and had an unfortunate ascent...controlled by kicking down as I ascended.
These things happen. Yours was an "incident" and not an "accident," so learn from it and move on. All this discussion about divemasters (the "masters" of the dive, right?) is just that--discussion. Everyone has their opinions.
The important thing to take from this is that you had a poor experience (especially the seasickness part), and now know how to make a better experience out of it. This was a "wakeup" for you about equipment checks, and a reality check about boats, divemasters, buddies, etc. It usually takes between ten and twenty-five repeats of a new activity to become comfortable with it. So learn from this, put it under your (weight) belt, and dive...
SeaRat