I just graduated in the US and I was approved for an EAD (OPT Program). However, my EAD took so long to come that I ended up leaving the US and coming back to Australia. I want to go back to work the remainder of time on my EAD. My advisor said I need to apply for another F1-Visa, but I am not returning to school, just to work. Is this the only way I can come back to work?