I'm pretty sure I had this in the States before Christmas... had most of the listed symptoms, including the breathing difficulties (which I don't normally get, also didn't fee like the normal flu... not that flu is normal - but just saying it did not feel like anything I had had before). I thought actually at the time thought damn! this American virus shit is tough!! Well I was ill for 3 weeks, the first week literally could not get out of bed for more than 5 mins. If I could have afforded to have called a Doctor I would have. Upshot is if you are reasonably fit and healthy you will be OK!! And just to say I am flying home on Wednesday from the US and I plan to offer myself up for testing for antibodies to it... as I believe I have had it so might be of help.?