car is in security lock down

It had been a month since I drove it., I was out of state. Went to start it and it would not start. Acted like it was out of gas. Put gas in it and it is full, even though the gauge shows empty. Checked all the fuses the deal with engine, full pump, injectors, and needed to start. Noticed that when I open the doors to get in the alarm goes off. Took the remote and locked and unlocked it several time, but it continues to beep till I shut it off with the remote. It acts is if it as stolen and it shut every thing down with the fuel system. IT IS MY CAR I PROMISE. Any way to retest it without towing it to a service center. Thanks Fran Stablow