All my life is believed home-sickness is crap, but now after relocating and living away from home for only 6 months, I must say: Home sickness is defiantly crap :D (you didn't see this coming didn't you? you were thinking I'll go for the cliché dude who had a change of heart ..han? Got you! ...but okay.. maybe a little home-sickness, keep it to yourself though!)
Well, you need to consider that all my life, my concept of a vacation was to go as far away from El-Cairo as possible. It's not that I hated El-Cairo, but I am person who LOVES change and I've been here most of my life, born, been to school, university and started working here. It's a bit too much :) Also living this long in one place tends to make you overlook the small things that make your life more fun. Be it as nice as being able to spend a little bit of time with your friends & loved ones or as simple as being able to read street names :D (My Polish SUCKS!).
I must run to indulge some more in El-Cairo, my advice to you is to plan your next vacation back to wherever that is home for you, after all, It's the best place to be.