I.B.
I had exactly the same with my 5 month old... I was working on this hours a day, with avent, gerber, soothie (because he takes this pacifier), NUK, Avent tempo,ventaire etc etc....Nothing worked and he could go easily without milk for 10 hours during the day. He just would not take it.My best guess was because he couldn't menage to create a vacuum around the nipples. I got a tip from a friend to order Sassy MAM Ultivent bottles (just google) online and guess what.... To make it succesful, I pumped every feeding and gave him this bottle, every feeding instead of the breast (Yes you have to invest some time in it, but it will pay off). After he was taking it more easy (about 2 days) I began giving him the breast once in a while again. Eventually I will go to one bottle a day. He happily takes the bottle right now. With complaining the first couple of minutes of course (mam is best :)), but after that he finishes them at once :) Really great bottle, he doesn't even have to burp after drinking... Let me know if it works for you... Also did you try to have your hubby give it to him?
When he start crying and moving, always keep the nipple in his mouth, unless he is choking himself. Start with the first one first feeding in the morning when he's still little sleepy and HUNGRY. I ordered them from baby-hugs.com. This bottle got great reviews and I read somewhere 95% of babies will take it.