That article might be helpful. I would call La Leche League and get free advice from a breastfeeding counsellor! They have great training and would have great advice.
https://laleche.org.uk/call/
Get naked and do loads of skin to skin together. If you have a bath then get in the bath together and try and feed in there (although don't stress if it's too difficult, I tried but we were both too slippery for it to work)
Yes just keep trying as it's probably a mild bottle preference but he will get over it! What teat were you using on the bottle? Ideally use one which is breastfeeding friendly like lasinoh. Did you pump whole you fed them formula? Do your boobs feel full? But yes I recommend la leche and skin to skin xx
https://laleche.org.uk/my-baby-wont-breastfeed/