Vauxhall Zafira 57 reg automatic will not start?

Hi,i have a Vauxhall Zafira 57 reg automatic, i parked the car, then went back to it, tried turning the key and nothing, all the lights inside came on. the P for park is not coming on, only two dashes, there are F signs coming on the screens rather than the mileage etc, the fuel gage is dropping to zero, i have had all the fuses and the starter motor checked out and have replaced the battery still the same problem. can anyone please help?