Nursing 4 Times a Day

TL;DR version: My 4 month old has been refusing to nurse during the day for over a month. He latches on for a few seconds, then pulls away and cries. He is exclusively breastfed. I have tried many different things, but I can't figure out why this is happening or how to fix it.

Hello,

This is my first time posting, here, and I would be so grateful for any help or insight into the situation I am facing. I have browsed the other threads here and searched up and down google, and I haven't found anybody who has experienced quite the same thing with their baby. I apologize in advance because I know this post is way too long! I just want to make sure I fully explain the situation and all of the potential solutions I have tried without luck.
Some background info:
My son is 18 weeks old. He has been exclusively breastfed from day 1 without any issues whatsoever until he was about 3 months old. I have always fed him on demand, which up until 3 months, meant he nursed about 10-12 times/day.
His weight gain and diaper output were quite good from the beginning. His birth weight was 6lbs 15 oz. By 2 weeks old he weighed 8 lbs exactly, and at 6 weeks old he was exactly 10 lbs. Unfortunately, those are the only earlier weight measures I remember right now. Though he is physically healthy (to the best of our knowledge), he has never been the "easiest" baby in the world, and has always spent quite a bit of time each day fussing. He has a colicky sort of cry that is really intense and just seems to come on out of nowhere, and we haven't really seen any drastic improvements with this at 4 months old.

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