I need weight loss help?

ok so im fat and i need help losing weight.. i have the motivation im trying really hard just for everything to fail after a week. i have tried the 3 healthy meal a day whole grain lean meat crap and its just not working alone so i decides and appitite surpressant by using slimquick the drink worked for a week and the pills just fail everything fails yet im still pushing to do this and im getting at the end of my rope and its getting over whelming.. i tried weight watcher.. fail.. atkins.. fail.. cabbage soup.. can you say starvation?.. becoming a gym bum... didnt fail but boy was i evil and over tired during this time was way too over tired and i had to stop cuz my job im always moving.. so i figured maybe i should go to my doctor and get try to get a presciption for phentermine? good idea? and any suggestions would work plz