Baby not having Aptamil anymore

Hi i am in desperate need of help. I started with breastfeeding my baby but then started combination feeding after 2 months and my baby accepted Aptamil really well. But his bottle teats got damaged and i could not get Dr. Browns teats as i was at a hill station . I tried giving him Aptamil through other feeders but he didn't take accept it. So i breast fed him for a month. Now that i have Dr Brown bottles my 5 month old baby is  absolutely rejecting Aptamil.  And i am panicking because i am weak and exhausted through constant breast feeding.  Please help!