I've responded to one other post of yours.... I am by no means an expert, nor are others here on this message board. But we are here to support one another. You are not being annoying. You are very scared, tired and frustrated and it comes out in your posts. You're fighting hard, and that's the first thing you have to try and discontinue.
You'd mentioned that you are almost accepting of your possible fear, that there are times when you've accepted you are "crazy" and feel better. That's exactly the point. The absolute moment that people with severe obsessions give up trying to control their fears in one of the following ways:
Checking with people around them if they are crazy
Checking with people online if they sound crazy
Checking whether or not people around them heard x sound or saw x object move etc...
Asking for reassurance with your doctor as to your diagnosis
The minute you give those behaviors a time out (WHICH IS INCREDIBLY HARD TO DO!!! BELIEVE ME I KNOW!) you will feel better. Your anxiety will begin to decrease as you are not feeding the survival mechanism in the brain that is ready to fight.
Cheesus (on this message board) had experienced many of the same difficulties you are experiencing, and posted some extremely thoughtful posts (he's very intelligent) on the board. If you perform a search for his name his posts will pull up. I'd recommend you read them.
In the meantime, I can say I definitely empathize with you as I too have experienced all of the wacky sounds/thoughts/internal voice thoughts you have and I am still here, in a Masters degree program, working full time and have made it to today without going crazy or being schizophrenic- which has been my main fear for over a decade.
Although it may help you to hear that now, it will not help you to alleviate your anxiety in the long term. Please look at Cognitive Behavioral Treatment and if you haven't already considered doing so- try asking for advice about taking an anti-anxiety class of medication called an SSRI. For you for the time being, you may even consider a benzodiazepine with SSRI, depending on your current level of functioning/anxiety. I am not a doctor, however, so it will be very important for you to consult with your doctor/GP or psychiatrist.
And I wish for you some peace. I know how hard this can be.... I definitely understand your fears.