Hey Rachie,
It sounds like you still have your mom attempting to control you and in some ways you are letting her do this. If you do decide to tell your mom what your diagnosis you can also tell her that you need her to love you just the same and you do not need her criticism. You can also tell her you would appreciate her being supportive of you while you are working your way through all this.
You may find that she wants to be helpful, but you also need to make sure that you and (if you have one) your therapist are working through this and that your mom must understand that she cannot control any aspect of your treatment. If she chooses to be critical of you, remind her that you are an adult and you would appreciate her respect as well.
If you need to, don't talk to her for a while. If she calls you and starts in on you, just tell her that you are not going to listen to that criticism, you have enough stress as it is, and hang up the phone!!!
I have been through this too - with my mom trying to control every aspect of what I do even to the extent of her insisting that she attend doctor's appointments with me (I'm 50 years old!!!). I have had to and continue to have to remind my mom that I am grown, I have children of my own who are old enough to have their own children, and I don't need her telling me every move to make.
Yes, it's hard to stand up to your mom, but once you do and you start finding your own way you'll feel much better about it.
best of luck, and let us know how you are doing-