How to solve rotation problems on screen

i have iphone 2g which was working fine from last 1.5 years and suddenly the camera capture button in the camera started tuning into down face whatever picture i capture it will show opposoit captured picture means (down face picture) and i have problem with some application as well like when i tried to play NSF car race game car will keep turning at the same place i cant control it and other apllication opens in down face and issue is i cant get landscape picture when i turn my mobile i cant able to view any application in landscape, not able to view landscpe keyboard. In one sentaence i can say i am not able view any thig in landscape & some of them doesnt work i f i see it also. please help me..