The 6 month testing went out in 2004.
I think you ought to listen to your doctors at the HIV clinic - that's a good source of info!
They already told you that you are OK - so you are!!! The 6 month test is a mere formality.
It sounds like you are suffering from terrible anxiety, losing all this weight and not getting good sleep. Look into getting some professional help to get through this unfortunate experience.
your test at 3 months was RELIABLE and CONCLUSIVE...proving that you do not have hiv.
no further testing is needed :)