>>1 You said that you've tried every solution possible in your head, but I don't feel like that's true. I feel like there's a range or circle, where you've considered all of the possibilities with it. Once you decided that you couldn't find anything within that range, you created two new options, murder and suicide, which didn't exist within that range before.
However, there's a circle much bigger that even those options fit into. I'm someone who believes that there are many mysteries to this world, and things that you can only find by looking at everything in the right way. Maybe what you need to decide to do is try to go against the flow of what's normal and the kinds of things that would be expected of you and other normal people.
One last thing I should mention is that having a strong connection with someone that's very real will help you through this. If you truly get to a point where you can talk to them about anything and will know that they will always be there for you then you won't need us anymore to help you with these kinds of things.
It's hard to give an exact name for what you are going through, but I think it's a struggle that everyone has, but people just approach or ignore it in different ways. In the end, I would be surprised if many, if any, people actually find a solution to this kind of thing. Best of luck though!