How will you know?

So a thought has occured to me, and that thought is "how would anyone know if I went REALLY insane."
In response to that I have to say, to begin with, how crazy am I now? The tendency of the human mind I believe is to think that you are sane. Usually if you were to ask many people, in all seriousness, if they are sane, they would say yes, perhaps they are the only one. Which may very well be the case. I don't know. I don't have the credentials. I am in the process of procuring the credentials to tell said people if they are crazy, but as of this moment my credentials are rather lacking. What I am in a better position to judge is my own sanity. I believe that while I may have an ego, perhaps even pride as some people might call it in who I am.
The thing that may shock some, if some could be shocked, is that my confidence in my own sanity is relatively low. In my personal quite humble opinion I think that there is currently a 50% likelyhood of me just SNAPPING like a twig and going totally nuts. What does that mean? Well it could mean any of a large number of things. These include several iterations of what I think I will look like crazy. The most likely is in my mind some sort of Don Quixote-ish figure. By that I mean that at the very least I hope it would be entertaining, but on the larger part I think that drifting away from reality is likely.
I could snap and do something else nuts, anything from the living like howard hughs, peeing in bottles and dying of malnutrition to going nuts and killing something.
But the fact remains rather at large that the most likely way for me to go crazy is quietly. I may already be there.  A slow and long lingering break with reality is both likely and perhaps unavoidable. I have no stabilizers at all right now.

I have plenty of other topics, but I forgot them all on the drive home. I'll be back.