Kate I know exactly how you feel, I always talked about weaning like it was no big deal, but it was such a special time the thought of it started to break my heart. The last time I BF, he pulled off himself before I had even let down, and he said "all done". It was very difficult for me and I was not pregnant. If you wouldv'e asked me before I had him, I would have never realized the special bond that it brings.
so (((((((((hugs))))))))))) and you will find new special ways to bond with him. I still give DS a bottle before bed, while I rock him, and he plays with his toes and my hair, and it is all ok.