They are 11 and 7. They bicker a lot. Tonight I have just made them dinner and dessert and gone to lie in bed for an hour whilst they watch TV downstairs as frankly I didn't feel too well. 10 minutes later I hear bickering and one saying the other is hitting him. I go downstairs and absolutely lost my shit shouting at them. I've just had enough. I feel so guilty but I just wanted 20 minutes quiet.waibu?