H1B approved with consular process..Need urgent help

[Jay.0823]

Hello, I need urgent help of my approved H1B. My H1B has been approved with consular process and I am in USA right now on F-1 status. My questions are:-

1) Can I make a formal request to USCIS, to change my status from F-1 to H1-B without leaving the country (though it was approved as consular process) as I am here. If yes how it can be done, will you able to make it successful scenario for win win situation. 

2) If not , what is the possibility of getting the VISA stamping approval in my home country, what can be the consequences and what can be done if that situation arise. I really appreciate your precious advice and suggestion in this particular case.

3) If they reject the stamping in my home country, can I able to get into USA on my previous F-1 Visa. 

4) If nothing works out, what can be my last option to get into USA, as a legal non immigrant.

I NEED TO ACT ASAP AS I DON'T HAVE ENOUGH TIME SO PLEASE GUIDE AND HELP ME OUT.

Thank you so much in advance.

[JoeF]

Need more information:

Did the employer file it as COS? If so, why was the COS not approved? Are you out of status on the F1, e.g., because of CPT?