I have never posted anything on here before and I don’t know how to tbh, so excuse me if I did anything wrong. Also excuse any spelling or grammar mistakes, English is not my first language. 
I just had a family lunch and my brother’s gf started talking about a video she saw about a girl with multiple personalities. So from there on we started talking about other mental illnesses. 
This is a topic very close to my heart, because I myself have depression and anxiety since I was 11 (I am almost 24 now) and have stayed at a psychiatry last year. 
Off topic but Rn I am doing very bad and get irritated very easily. I can’t really communicate and get aggressive, which I hate so much!! My parents kind of know, because I have lived with them again since I was at the hospital. 
My brother and his gf don’t know, but my brother doesn’t seem to care and never asks how I am. Don’t get me wrong, I love him to pieces and we are kind of close, but right now I am just mad and feel misunderstood. 
So back to the story: 
I started talking about a woman I met in the hospital who had these attacks where she just falls to the ground, becomes unconscious, has epileptic symptoms, scratches herself, screams and hits her head on the floor. In my hospital they told her that there was a new medication that worked with similar cases. She has had these attacks for almost 8 years (after a trauma) and they occur daily. 
After two weeks of taking them and her being super hopeful, she finds out that the doctors lied to her and just wanted to try if a placebo could work (but the placebo had never worked on anyone else before). She of course was super sad, confused and also angry, because she didn’t understand how they could lie to her like that. I was one of two she talked to about what happened and she felt betrayed. An important court event happened the next week and she felt even worse after the doctors told her it was all a lie. 
My brother then said how I think she should be treated if nothing works. Because it can be psychosomatic and placebo could work with that. 
I told him that I don’t know (he doesn’t really know either) and that I just think it was disrespectful of the doctors to give that woman hope if there was none. 
He said yeah but how else should they treat her. 
I said “well, not lying to her would be a good start.” 
We talked more and I got really frustrated and kind of aggressive and I feel bad about it, but I feel like they all don’t have any idea what they’re talking about and I don’t even know. 
He then said why I always get so aggressive when we talk about stuff like that and why I never listen. 
I just feel like my family is not in the place to educate me on mental health when I have read psychological papers since I was 14. My brother doesn’t have any idea about medicine nor mental illnesses so I just felt misunderstood I guess.
I started mocking him and things escalated to I left the table. 
I don’t want to excuse myself for lashing out just because I am doing bad, but I am at a state rn where I fight everyday to live and I can’t tolerate people educating me about stuff they don’t know anything about. 
But I also know that I overreacted and should’ve just held a conversation/discussion like a normal person. I just don’t have the patience rn. 
I really need advice on how to talk to my brother about it, because I kind of feel bad but on the other side I don’t haha. 
Please tell me what to do and how to talk to him. I don’t know how to tell him that I’m doing very bad without worrying him and I always feel stupid when taking my mental illnesses as an excuse, but I guess that’s what I have to do. I really don’t know… please help!!!