Anyone here crochets with Carpal tunnel or tendonitis?

Doctor told me long time ago to "get another hobby" because of the problems I have with my hands (bad tendonitis and now carpal tunnel) but I ignored him all this time. Now it's getting so bad my hand goes "to sleep" and hurts/burns and my grip is all weak. Anyone here has any tips to help with this? I really don't want to give up crocheting, specially in December!! This is when we usually all do crocheting marathons to finish before Christmas!!!!!