Isn't the treatment for the distress basically to treat the person of the gender that they say they identify as?
I believe that you identify as a woman and I doubt that you would a) appreciate anyone telling you that they don't agree with you b) reduce that identity to the mere presence of genitalia?
I think this reductionism potentially does women in general a disservice because if we reduce 'women' to biology then we open the door for a lot of the efforts made to help women reduce inequalities to be dismantled unless they have a biological basis. Or worse, the invention of spurious biological justifications for inequalities.
I'm sure we agree the experience of being a women is more than the experience of having female genitals and, if we do, then surely that also allows for an experience of being a woman absent female genitals? It may not be the same lived experience as you but that doesn't mean it's invalid. After all I'm sure there are all sorts of women who have all sorts of different lived experiences from you. All that is being asked is that the range of 'lived experiences of being a woman' includes transwomen.