'huge, queer and tawdry' but 'much admired by the public'

How did the Doctor know there was going to be a countdown in a years time, so he could tell Martha to go and make everyone think 'doctor' at that point? Why did he risk everyone's lives with trying to 'break free'when he knew later on that he was going to be 'restored'? If Martha suspected the doctor was dead then why did she carry on, because it was only him who saved everything? Also if they went 'back' then surely all the guards and stuff would remember as they were still on the ship? If not don't you think they'd wonder why they were no longer being all Waaaaaaaaaaaaaaaaaaa at the president being killed and were actually somewhere else? If the doctor was aware enough to tune himself into psychic network and stuff, why did he let himself be treated like a dog by the master? He was with it enough to tell martha what to do.