Have you tried to sit him down and give him a real hard talking to? I'm having issues with DP too it really grates on my nerves just feel like jumping up and down saying 'I'm carrying our freakin baby for figs sake back off!'. Have you given him some information sheets or possibly dragged him to your doc to get the doc to explain that you aren't whinging it really IS that tiring?

Best of luck and try not to stress, biggest comfort hugs!