baby not sleeping

so my baby is now 6 weeks.  she doesnt sleep at night.  she only sleeps from 5 am - 8 am and then 20 min naps throughout the day....i'm exhausted....any advice?  she is bottlefed and drinking about 4 ozs every two hours. 

Where is she sleeping? In your room, bassinet, her room, etc???
We found that even though our daugther was so young (5 weeks) we started a routine in the evening, and we put her in her own room and own crib at 5 weeks old!!!

Sounds like she still just has her days and nights a bit switched. Try making the house bright during the day....don't draw shades during the day...make the usual noises, dont tip toe....

Then at night, calm it down, draw the shades, dim the lights...this may help.

Do you swaddle her? Where does she sleep? Give us more details about your routine with her so we can offer suggestions.

she sleeps in a bassinet in my room and yes i swaddle her.   

Then I have to reiterate what everyone else has been saying. Consistency is key here and a lot of little ones do end up sleeping better when they aren't in the room with you - they KNOW you're there and they want your attention!
What worked well for me when Rowan was still sleeping in my bedroom was to keep him as active as I could during the day (but with some regular naps) and then have a set bedtime - around 7:30 where we had a specific "getting ready for bed ritual" and made the room as dark as possible, fed him, swaddled him (this was all complicated by needing to keep him upright for 30 minutes after all meals due to reflux) and did everything I possibly had to do to soothe him to sleep. If he woke up sooner than a couple hours later for feeding, we would repeat the soothing process as needed, even if it meant I was spending a lot of time sitting in a dark room in a chair rocking him. Under no cir****tances did we give up and go into a bright place or go play. We have to teach them how to sleep, and it can be a hard thing to learn, but putting every effort you have into now will really pay off later. have you looked at the Happiest baby on the Block? If not, I highly recommend the DVD, the techniques are invaluable - sometimes swaddling alone just isn't enough.

Agreed totally! I would recommend her own room and crib and lots of repetitive consistency!  Once we did this and started a routine she settled right down. By 8 weeks she was sleepin 8-10 hrs through the night without waking!

Hang in there!