Hello, Popeye.... Nice troll.
Doubtful. You are still impaired by alcohol, dehydration and lack of sleep.
As for the rest of your questions, if I'm running the charter:
Yes, if they cannot execute the dive safely. However, since seasickness can clear up once the diver is in the water, I might suggest that divers with mild, or even moderate, symptoms get in the water and see if they recover enough to dive.
Yes, if they can't clear or are presenting with symptoms such that they cannot execute the dive safely.
Only if they are presenting symptoms such that they cannot execute the dive safely. After all, if they are certified, one can certainly hope that they disclosed their condition to their doctor and obtained the necessary approvals.
Same as for asthma or diabetes.
I don't. That's why my charters are limited to people with functioning brain stems.
Your statement is incorrect and irrelevant. If a person can execute the required skills to standard and meets the other criteria, then they can receive a GUE certification. I'm also fairly certain that all of the GUE instructors with whom I've taken classes would work with such a diver to help them perform to standard.
While I'm sure that there are medical conditions that would preclude issuing a GUE cert., I'm equally sure that a physical impairment is not a per se disqualification.
My charters, my license, my rules.
Moreover, since I don't like performing rescues, on charters that are not mine, if someone is impaired, whether due to a hangover or otherwise, I'm going to mention this to the person in charge of the trip and the captain. Its their decision whether to allow the person to dive.
Not really. There are measurable amounts of alcohol in the blood when a person is hungover.
Even if there were not, the question is whether an impaired person should dive. A hungover person is impaired. Once again, my charter, my license, my rules.
That's a precedent I'm more than happy to live with. If any of my divers showed up hungover, it would be the last charter they took with me.
Since I don't dive while sick, drunk, hungover or otherwise impaired, I'm not overly worried.