Honey I am happy to share my experience.
I have been almost exclusively breastfeeding until 5.5/6mo. We had many BF problems in the early days as he was sleeping on boob, not taking enough, not taking much weight so I was stressed a lot. This was an illusion that something is wrong as from week 2 of his life he started to take muuuch weight but still the stress from first days stayed.
I had couple of situations which I recall now which may help you/calm you down:
1) We did had days when he was just eating a little at some feeds, both on 3 and 4h EASY. I thought he will be hungry but tried to stick to the routine, not panic and it went ok. Sometimes it was days when every single feed seemed little, but as he didn't cried until the next feed - I think he just wasn't very hungry. There was a period when he woke very hungry at 7am, so was not hungry at next feed and ate less - and than the next feed was huge. I alternated breast every single day so we started 7am feed one day from L one day from R side.
2) when we move from 3 to 3.5h EASY my breast was not ready. DS emptied both and seemed to need more but I just stick to the routine. I offered both breast at every feed, do compression, sometimes even doing 3rd bbreast so going back to 1st one after 2nd. I think his NF (he was on one I guess) was slightly bigger those days, but it wasn't a problem for me as he did feed on both sides instead of usual one sided feed. It took 2-3 days and we were fine.
3) I remember that when he took a small feed, I was sometimes trying to top him up with expressed milk or even offer formula but you know... it was always a mistake. He didn't want it or took a little and it just stressed me out. I think there was 1-2x a situation where he was not hungry, took a little feed but cried of hunger 30min later. So I just fed and he was ok. All other occasions were him just wasn't too hungry.
I always thought that his low interest in BF means problem with my supply. But it was the other way

. When he didn't want breast it meant he was not hungry. Believe me that when he was hungry and two breast seemed not enough for him, he wanted to feed constantly not the other way around. As the breast were empty, I just finished feed, calmed him down in my arms and waited for another feed or decided I will feed him slightly earlier if needed. Usually he was totally fine until the next feed:).
HTH