I've never seen the -ing form used in such contexts, only "You've lost me/you lost me". I wouldn't use the -ing form, but would be interested to find out if native speakers would.
My first reaction when I read Ostap's question was to answer, "Yes, and you can also say, 'You've lost me there'".
Then I began to wonder if you could actually say, "You are losing me." There seems to be no reason why we shouldn't, but I don't think
I do. Let's see what other native speakers have to say.
Oh - while I was writing that, bhai answered.