Is there a such thing as suppressed schizophrenia. Could it be possible to have schizophrenia, but somehow control it.

I am 21. I don't really remember how long its been happening, maybe 2-6 years range.

Every once in a while, usually when I am subject to lack of sleep due to excessive hours staring at a computer screen. I start to "hear" yelling or screaming. Its not hearing like you would hear in real life. What I seem to "hear" I know is not there and is not real and it seems more like I am thinking about it rather then hearing it, but it comes to me as sound none the less.

This yelling/screaming makes me think of/reminds me of (while its happening) a person locked inside of a dome shaped chamber completely made of steel or metal. This person seems to be male, and is screaming or yelling, maybe at me or to me. like he wants out.

It lasts for maybe 5 minutes. During this time I think to myself "Here it goes again" and think things such as "Shut up" or try to think of things that can take my mind off of it( in hopes it will go away).

It isn't scary or anything. Just makes me a little uneasy, uncomfortable, or annoyed to the point where I want it to stop so I can continue with my day, or night in most cases.

I think some similarities of occurrences:

1. lack of sleep
2. lights off
3. on the pc working

It would be much appreciated if I could get any information on what this could be

And just for the reader reference, I am poor, and broke. So telling me to see someone I have to pay so they can diagnose me or better evaluate me wouldn't really help.

Thanks