Really as you are under the are care of a doctor for this (whether or not you gave to pay for that particular one) and we also can't give advice into further drug therapy, I am now going to have to close this thread.
Hopefully you've got all the help you've already needed from the urgent health centre but also remember in the future you can speak to your GP (which everyone is entitled to on the nhs) regarding pain meds, it doesn't just have to be the specialist) and they can help you further and prescribe you meds if they feel it is needed. Due to the fact it sounds like you gave something pretty complex going on at the moment we can't give you any other advice on how to aid the pain but I REALLY hope your operation goes well.
If you want to discuss this decision further then feel free to PM me.
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