TBH I'm not sure.... I think I have to get a sick note from my GP and I don't think he'd be willing to give me one just because I've got a badly burst blood vessel!
I'm not sure what I'm entitled to really...
I think it depends on how long you have worked for them....When I worked for the Co-op we were allowed 13 days sick a year with pay. I expect every where is different..you should find out tho.
Also you don't usually have to have a sick note until the 7th day..you have do a self notification up til then.