I would say from this you are getting better at detaching.
I know it is difficult, I struggle still with the very same things.
I am also a sarcastic person by nature. Years ago, I went through what you are feeling now, that it was changing who I was. I soon realized that my 'witty' sarcasm still had an underlying tone of anger. I quote I still remember to this day is 'Sarcasm is anger's ugly cousin'. I still can't help pulling out funny sarcasm but I also am very aware of the timing and tone of how I say it. Even when I think I have said something funny that is sarcastic, people will take it the wrong way, not the way I intended it.
You are not changing who you are, you are merely becoming more AWARE of who you are...this causes much internal reflection, hence the quietness and feeling like you are stuffing down your feelings. Trust me, if you have something that needs to be said, you will say it, only this time you will be aware of when and where to do this.
Your mom has the best of intentions, she is worried about her daughter. She means well, she just doesn't want to see you hurt and suffering. Do what is right for YOU, how you feel about the whole thing and really what YOU want to do.
I got to the point too months ago where I couldn't cry any longer. You are getting better and you are doing so well. Keep pluggin' along Angie.
p.s. come join us on FB!!! we use our screennames with db at the end. Some people use their real fb accounts, too. Whatever you choose.
Me:49 H:47 S: 16 T:27 M:25 My EA: 2001 His PA: 10/2007, 6/2013 Separated, but H still in house
Find your Shambala: a place of peace and happiness.