[Malice]

I have a problem of my own, and hopefully a protoss player better than me, or around my skill level can help

http://www.sc2sea.com/replays.php?do=viewreplay&id=2161

I have literally NEVER been able to hold this kind of phoenix allin. I've tried making immortals, 3 gate robo openings, going up to mass gateway, making a lot of probes, cutting probes, but it just doesn't seem to work, and I have no idea what to do.
What i've been told to do by a few people is go 2 gate robo expand then quickly up to 4 gates and mass gateway, but from this game it just doesn't seem to work, and I delayed the push pretty hard. It's starting to get frustrating now, because I can't just not expand, since if they're going for economic phoenix play, then I need a much earlier expansion than them, or I fall behind.

I even knew he was going phoenix from the start (probe scout 2 zealot + sentry opening), so I played quite greedy until I knew he was allining with the observer. This is 1200 masters on NA also.
Hopefully someone can help me >.< because I'm running out of ideas and patience in trying to hold this stuff.