aww how awful, I know they are sometimes crap but have you given NHS direct a call, they might have some idea's and at least you will get to speak if not see a nurse or doctor.
This cant be normal and if I were in your position I would be hysterical.
We think having the op is the end to all our problems and dont consider it might bring a whole new set with it but whatever it is they can sort it out you just need to be persistant and make sure they listen to you, you CANNOT wait until MARCH for an appointment are they bloody mad.
Phone them today and expain calmly how you feel and what you are eating and drinking and what is hapoening they will know what to do and how to make it better
xxx