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If there is no way for surgery, my only suggestion is to find something in life that makes you happy and can serve as a distraction.
Even after surgery, the cyst will still be there (albeit smaller and in a location not causing damage), so always monitor your body.
There will be good days and bad days, so just ride the good days out and enjoy life as much as you can, and don't fear the bad days as it will take away from the good ones. A positive mind set can go a long way in personal recovery.