Hi A.,
Yes, I totally went through this with my 2nd son right around the same age-- 10 months or so. It sounds like a nursing strike. It was totally out of the blue-- no rhyme or reason, and it caught me completely off guard-- just one day I put him to the breast and he would turn/lurch away and be crying even though I knew he was hungry. Sometimes he would even arch his back-- it was so wierd and unexplainable. I was devistated and thought maybe he was weening himself, but my gut said he wasn't ready and something wasn't right. I spent a lot of time on La Leche league and continued to stick to our routine and offer the breast and tried to be calm when he rejected it and was screaming (I was an emotional basketcase of course, but was trying to be calm :)) Anyways, 3 days later he resumed nursing as if nothing happened and to this day it is still a mystery as to why he went on a "strike" as they say. He ended up self-weening at 22 months!! Both of my boys self weened (at 14 months and 22 months, and it is more of a natural-feeling, over time type of thing-- at least my experience. What you are describing doesn't sound like he is ready to ween but more of a nursing strike. I would recommend checking out LaLecheLeage online and continue to offer the breast, and pump if you are in discomfort. Chances are, he will resume breastfeeding. Best of luck to you!!