Peet, you have got an earful here, but don't think Bypass pay is going to help you predicament much, its only another $5000p.m and then you'll only have it for 3 months before you upgrade anyway.
Sorry but i agree with the others regarding your unit. You must have made some capital on it now, so why not sale up. Give yourself a financial injection, and rent something a little bigger. That way you'll improve your lifestyle. and it'll all be roses.
I have no kids but the best thing i ever did was move out to S.K. we have 2100s.f and loving life. I've got my upgrade around the corner, but i don't really want it as I'm loving life out here.
Good Luck with it all.