It sucks to hear you are sick. As far as PCT Clomid is a stronger SERM for certain. Although Clomid and 20mg nolva is great if really shut down.
As far as the length of the run considering that it is not liver toxic I personally wouldn't see a problem with extending your cycle to 12-14 weeks. This is actually quite common in real AAS users running Testosterone and the like. So long as a proper PCT is performed you should be fine. The longer you are on the harder to recover but you should be able to recover unless there is already an issue with your HPTA. Obviously you should add in some cycle support to make sure your lipids are not getting out of hand and monitor your blood pressure but from an HPTA recovery standpoint I think you would be fine.