Help with feeding in a expressed milk in bottle fed baby of 8 weeks?

My son is now 8 weeks old.He was very unsettled in the first few weeks(4weeks)he was exclusively fed.his latch was still not very good at that time.The nurse suested that I start using bottle to top with formula milk.a few day after I did not have any milk for 3-4 days( got dry).the baby was fed with formula in a bottle then.when the milk came back again he refuses to feed.I am now expressin milk(2 ounce short of the amount my son drinks).he stays on the brest just for 2/3 minutes before he starts to cry real loud(he dont not like to nurse on the brest now).It saddens me that I have to bottle feed him and he does not brestfeed on me any more any ideas how i can get him ot start brestfeedin again and get him to latch to my ?I feel Im loosing the connection with him and this is upseting me.please help