Possible dairy sensitivity?

TMI POOP! 💩

Recently my LO has been super fussy after evening feeds usually 4-9pm and has had mucous in her BM’s. She had a few specs of red blood in her BM about 2 weeks ago. She is also super congested in the evening; I have to use the snot sucker and saline spray almost every night 👎

I’ve been reading along and it sounds like it could be a dairy sensitivity. We have a doctors apt coming up, but wondering if I should eliminate dairy from my diet? I’ve read it takes up to 6 weeks for breastmilk to be free from all traces of dairy consumed by mom. Any mamas have similar experience?