I'm depressed, have considered suicide, stress and other issues - any solution?

You need help, plain and simple... and I don't mean mental help when I say that! You need help juggling all these responsibilities... You are on overload. Trust me, I know all too well what that feels like. Your 17 years old and your moving into adulthood. My advice to you is to have a sit down with your guidance counselor in your High-school and let him know exactly what is transpiring in your home. Your guidance counselor is obligated to help you find resolve in these types of circumstances. You need to divi out some of these responsibilities on to someone else. Once you do that you will feel as though a huge weight has been lifted from your shoulders. I know this sounds easier said than done but you really need to make the effort to help yourself. If life was easy it would be pretty damn boring... You seem like a strong individual. Muster some of that strength up and start using it on yourself. There is no reason in the world for you to end your existence... trust me life is too short as it is... and these fears you have.... health related, don't let them wear you down... Look at the glass as though its half-full rather than half-empty.That's the mentality you need to have. You will survive all this and look back on it one day and remember it as a long winding, bump filled road that you traveled to get to where you are... Be strong brother have faith in a higher power. You will overcome.