Hi Maz,
first of all, best of luck with the medical, I know exactly how you are feeling .. sick to the stomach no doubt ! The contact lens issue depends on your normal use - have you worn contacts before ? If you haven't, you have to have a letter from your optician stating that you have been wearing contacts for a month consistently and successfully for over 8 hours per day. They will check this so don't go without it ! If you have worn contacts before the JAA states that you must carry a spare pair of specs anyway while you are flying, so you would have to have glasses made up no matter what!
Hope this helps and let us know how you get on !!
divorcingjack