4. He wanted very much to go long-haul but was not accepted.
How do you figure that? There is no way for a lufthansa cadet to start directly on longhaul, they all have to start on shorthaul for at least four years before they can move on to longhaul.
Why did the Doctor not advise LH ?
How could he? Doctor patient confidentiality laws play into that, telling anyone would have been a breach of law.