Cold water swimming

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Hi. Does anyone here swim in the sea at this time of year? I swim for half an hour daily, in Ireland. Water temp is around 10/11°C. Hopefully I'll carry on when it hits single figures. This is my first year of doing this, I started in July when it was 16 degrees, which seems like a distant memory now! I swam with just a bathing suit on until the beginning of the year but now wear a wetsuit top.
I'm still needing motivation though. I lost 13kg then put on 6kg while on holiday, then Christmas. I can't seem to stop eating chocolate and anything I can get my hands on. Path to destruction but I can't stop!!
I swim and walk daily then eat all the calories I gain in exercise. Help!