Ellie, he does sound as if something is going on... Don't blame yourself My first baby was very similar ... Not sure we ever cracked it but muddled through with mr f taking him out for long walks Though eventually we tried cosleeping and I managed to get enough sleep You must try are to look after yourself - ESP in this heat Drink gallons Eat regularly Have a shower in the morning, and prob again in the evening, or a coolish bath Don't worry if you feel like you have no milk left, it's when he feeds and you feel empty that your body gets the message to up production (growth spurt) How is his weight gain? Is his poo yellow? Why do you think he's dehydrated? That's cause for concern