Gosh! That sounds like something out of Alfred Hitchcock's birds. The nearest experience I've had to that is when we went to Glesga (Glasgow) & Mother & Father decided to eat their sandwiches in George Square & lots of pigeons came down & nicked their sandwiches.We're just coming out of the swooping season in Queensland. There is a period between August - October when birds like attacking people... mainly magpies and Plovers. It's when they've got young around.
I haven't been attacked by magpies (who are the worst culprit) but have been targetted by Plovers a couple of times. Kind of a weird experience with a screeching bird in your face... and as I told Mrs Britbox, those Plovers are pretty aggressive too,
Poor you! I don't like magpies as we feed our birds & we saw a magpie eating a blackbird chick so now we scare magpies away when small birds are in our garden. I thought that cockatiels were native to Australia. They're 1 of the noisiest birds I've ever heard although they're beautiful.