Hi Emma. A truly horrible situation to find yourself in. I too have experienced the same thing. Try not to assume the worst and as you have no physical evidence its probably your anxiety causing the worry. Move on, be healthier and put yourself first always. 'Blackout' by Sarah Hepola is a truly eye opening book as has been suggested already and a must read for any female who has any sort of problem with drinking. Take care.
Summerbee.