I have had sessions where I leave feeling very upset as you describe. However, itvwasnt every single session over a long period of time (e.g. many months). Also, overall therapy really helped improve lots of things in my day to day life, right from the start.
Are you able to kind of "zoom out" from the upset feelings and see whether your life is getting better overall, compared to before you started therapy? This is the kind of thing my T always says to me!
I would suggest that if it is, then therapy is probably helping and some amount of upset is to be expected. I agree it's a good idea to talk to your T about it.
But I think that therapy shouldn't be only making you upset, without any positives or anything helpful. If it is, then perhaps you need a different kind of therapy - again something to discuss with your T?