Thanks ladies
I've stopped pushing the feeds if he doesn't want it he doesn't want it. He's been a little better with the biting but still does it at least once most feeds. I've just been biting my tounge, trying not to yell out and putting him down as soon as he lets go.

The other issue I'm having is sleeping (probably a topic for another thread but...), the last 5 days he's been having about 30 mins to 1hr's sleep in a 12 hr period, still sleeping ok through the night. He's really tired -droopy eyes, screams/ winges every time I put him down, etc but refuses to sleep. Everytime I put him in his cot he cries until I pick him up. I'm a bit worried that he's begining to associate his cot with crying. (Although right now he's lying in his cot yelling and talking lol.)
Even when I try rocking him to sleep he fights and fights and fights until he can no longer stay awake and falls asleep in my arms/ on my shoulder/ sleeps while I'm feeding him and wakes up when finished. He has also started crying when he wakes up from a sleep too, which he didn't usually do.

Again, could be related to gas but even after I've spent ages patting and think I've gotten it all up he still wont sleep.

Any ideas? I thought maybe separation anxiety but he's ok when he's not tired.