Clear the bottom of your UI screen, move the chat window etc. to the top of your screen. Get used to using the pan view keys, page down, home. And get used to not being able to see what you're hitting. As for being too big to run in small corridors, well now you have a good excuse for why you can't be the puller
[You must be logged in to view images. Log in or Register.]
As for the nausea, this is hardly the place to seek medical advice but if you ask me it seems psychosomatic.
Being the biggest isn't all bad, apart from heaps of stamina there is also the ability to jump over barriers that sub-ogres can't. The wall at the moat in CoM is a good example.