How can I get funding for surgery for medical reasons in the UK?

I have myasthenia gravis and be a use of medication have gained weight. My breaststroke have become so big my back aches alot and I just have an odd.figure. it's really getting to me. Feel down alot of the time because I feel I look fat and ugly. Appreciate any advice given as I can't afford to get surgery was just wondering if there's any help anywhere. Thanks x

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