Let me tell you something, this is not crap: you should consider that all of these happens for a reason and the reason is that you can learn about all that is happening around you.
Now, you say that everything is going wrong but I can't understand why you say that. Maybe be can help you because all of us are diabetic: you are not alone. The most important thing is that you are alive, you have the chance to make things different.
Diabetes is difficult only if you allow it. Your family needs to understand the meaning of being diabetic; nevertheless, the most important thing is that you understand how to deal with it.
Finally, you mention the hipoglycemia of your mom made you get angry but I will tell you something: my mother has had to take me to the hospital 6 times because of my low-levels sugar and still supports me to avoid this situation. I think that you should talk to your mom and make her understand how to get her normal levels. If my mom hadn't helped me when hypoglycemias I would be dead.
You are lucky, your mom is OK and we know it is scarry, but the most important is that you help her to eat appropriated food, use right medication, sugar test and (of course) talk to her and make her aware of her own condition.
You are not useless, maybe is just the stress that situation caused, but you can still do that. Your mom is OK and I know it is difficult, but improving every aspect I am pretty sure it won't happen again.
Don't worry, ■■■■ happens, now is your turn to avoid it might happen again. You are not alone, here we are to help you and your mom. Best wishes.
PS. Year is not over, let's keep fightning