'sitting on pins and needles'

Just sent an email message to my favo(u)rite Aussie and used the expression 'I'm sitting on pins and needles'. In the US, that means a state of some concern over the future outcome of some important and concequential set of circumstances. I wonder if this is an expression used elsewhere to discribe a state of apprehension or if there are other phrases that represent shorthand for this feeling. Thanks to all.