I know what you mean mate, but the last thing you should be worrying about is getting back bloody driving. I get the livliehood bit, but just you concentrate on getting better I would say.
My Auntie was diagnosed 15 yrs ago, had most of her lung removed, goes for periodic checks and is fine, so all is not too bad mate, like I said 15 yrs and still counting.
Really hope you get yourself sorted, and Good luck…mean that.