Help! I need some advise xx

Does anyone have any advise on how to get my 5 week old (6 on Monday) to sleep more than 10 minutes at a time? Its getting so frustrating. She is clearly tired but it takes ages to get her to sleep then 10 minutes later she is awake again. She does suck on her fist but she isn't hungry as the first thing I try is giving her a feed (most of the time she refuses). She is breastfed as well. I haven't given her a dummy yet as I really don't like them and I didn't want to interfere with breastfeeding but I'm so close to trying it just the soothe her when she is sleeping. I have tried white noise, making the room dark and quiet, having some slight noise, making sure she only sleeps in the same place. I have even spoken to the doctor today who just said she should settle by 8 weeks (as per usual, no help). Any help would be appreciated. TIA! 

Jade xxx