I am in same situation...The extended Opt expires September end...have good longterm project but have not got approval yet. Did you try researching more on that cap gap rule?

 I tried so many website and they all talk about what happens before oct 1...not one website says anything about what if the H1B application is still pending after oct 1.

I am so confused and do not want to lose my job. I have called my Advisor several times but she is so busy and has not replied to me yet. Can you call your int advisor? May be they have more info on that cap gap rule.

Because the cap gap rule is all about covering gap between OPT and H1B approval I am hopeful that we can continue to work after oct 1 till we have decision from USCIS.

If anybody has any more info on this please suggest. I really appreciate all of your time.