Willow the girls have given you some excellent advice. And you're doing a great job If resettling is getting you down, can you put him in a pram for one of those times each day and take him for a walk? This may send him off to dreamland, or if not, at least it will give you and DD a little outside time together. (or a sling?)

And the others were absolutely right when they say this is just a teeny tiny blip on his childhood timeline. Keep on going Willow, he's obviously a very contented little boy (judging from his looooong night sleeps). You and he will work out a routine eventually if he needs one, or you'll learn to go with the flow if he doesn't