Try to plan a nurse in and just stay in bed with your LO for a day or two and do lots of skin and try napping and cosleeping. When baby is sleepy try to get him to latch - try while lying down. When my DD was refusing to nurse during the day I would get her to sleep on my bed, pull the paci out and she would root around looking to suck and there was nipple. You DS's mouth is large enough that he may latch well.

Another mama on the forum EP'd for three months and now her DD is EBF- lilliebelle. She would probably have good advice.

It could be a slow process but worth a try...