I see a lot of excellent advice here, so I won’t repeat what you already know, but I just wanted to add to the righteous indignation about your ex-boyfriend. Good riddance on such a petty and hateful person. For the rest, stutter and blocking go in waves for me, so some periods are better than others, so try not to obsess about the trembling, if you can. Focus on what you love, who loves you, and who you are. Those are your best chances at actually improving or finding a healthier perspective in life (which you totally, absolutely, unconditionally deserve).