E.B.
I have no real amazing advice.
My youngest nursed until March of this year. He turned three in June, to give you and idea of how old he was when he stopped nursing.
He would do the same thing with M. if he was stressed out or scared. He has a Sensory disorder so things can get very over whelming,
He would nurse for what seemed like forever in the afternoon...and then again right before bed.
By Fifteen months they are no longer needing milk from mamma as soul nourishment. It is more of a security thing. It sounds like when you guys get home he just wants to be with you....and when you take him off he is upset because it was not on his terms.
There is no easy answer for how to remedy this. I hope you get some good advice:)