I think honestly the best thing for you to do to save lots of stress especially around your exams is to buy a new passport, tell student finance to forget that passport you have sent them, go on holiday, and then send them that passport when you get back. If that's possible.
On a side note, has anyone had any difficulties speaking to an advisor? Yesterday I was told the systems are updating and to ring back the next day , so I rang up today and apparently they upload information on a Sunday so the systems are down whilst they do that... Hopefully they should be open tomorrow.