I'm sorry to say, but if you're gone for so long that more than one story arch has passed, you might end up having to play your character in different areas and/or in different ways than you thought. It's quite frankly unfair to expect other members to shove everything aside to accommodate you.
Sadly, there are times where we'll be absent, and sometimes it's for reasons beyond our control. At the same time, this is not our fault, thus should not have to affect us on any large scale IC upon return. You leaving is considered to be your character leaving, or dropping off the face of the planet for a while as well. As such, you'd need to come back as if that's what you had done.
