I am back, hopefully for longer this time. Have had quite a few problems, including the removal of a cancer, but have been told I am OK now. Anyway back to your problem. I think this is a certain case of OVER watering. It is said that fuchsias cannot be over watered. Rubbish. They are fibrous rooted , and if over watered they will drown. They should be kept moist, not wet. The only advice I can give is to re-pot it in fresh compost, put it in a cool shady place, and hope for the best. I have registered a few new varieties, and will try to send pictures of them soon. Glad to be back.