hello has your dentist checked for gingivites or piorea of the gums..Your bad breath (halitosis0 is caused by teeth and tongue bacteria.
You can brush and clean your tongue but to me the best advise is get oral care from a dentist to rectify any gum disorders.
Nothing wrong with your hygiene as i lost all my teeth after my third child due to constant abscesses.
Your dentist may also give you a mouthrinse to use at home.
If finding a dentist is a problem a healthy diet and floss after every meal should help.
hope this helps you.

the cheap way to help you is get a whitening tootpaste.
you can also buy baking soda and dip it on your tooth brush and brush your teeth. you can also goggle with perioxide. this is what whitened my teeth.
my girlfriend is from Africa and she told me that if you buy an orange peel the skin off a little and the rub the inner part of the orange on your teeth, it turned her yellow teeth white. she even rubbed her teeth in from of me and it was squeaking.
now for your breath, brushing you teeth may not work, unless your brushing your tongue also.
but what you need is a mouthwash, dont get the cheap kind because it's watered down. this will help you.
always keep a mint in your pocket so you wont gross people out. lol

that sucks my sister has the same problem, hre teeth are nasty and she brushes more then me, i think it has to do with gentics who knows