(((((( Granite )))))) I am so sorry you had such a terrible time in session that you told your T you quit.
Like others who've replied, I tend to think that maybe this T isn't the best T to help you, if she's not prepared to pitch in and help you deal with feeling like you can't talk and letting the silences drag on and on. I know you've been having this issue with her for a long time, though it seems like there are times when she does come up with things to do that help you express yourself and feel a bit safer. Generally though it sounds like her habit of allowing the silence to drag is making you feel worse and more and more unsafe over time, instead of your feeling more secure and trusting.
Do you think you could go back to see her and tell her this, tell her why you want to quit and see if she doesn't finally understand that the silences are just not therapeutic to you? You've invested a lot of time and effort in this therapy, it might be worth giving it another go and really making an effort to show her what you need from her. I remember you used to write to her until she stopped that, do you think she would reconsider letting you write what you think and how you feel? Just throwing out ideas here...
I hope you are feeling better today Granite.
LL