Hi! I fully agree with Helen. Please have her seen by a vet as soon as you can, ideally today; this is a serious health problem. We have got a piggy savvy vet locator for our UK members on the top bar.
With members from all over the world, you can help us a lot in giving you appropriate advice and recommendations straight away if you added your country, state or (for the UK) your county to your details, so we can take the particulars of your part of the globe into consideration. Please click on your username on the top bar, then go to personal details, then location. Thanks!