Welcome to HCM,
Your observation that milk and milk products(except curd) causing bleeding per rectum
,the next day points to a very important aspect of milk.Milk usually considered the safest and healthy food can in some people cause constipation
because of opoid like peptides present in it.Constipation in effect can cause difficulty in evacuation as a result of which straining is imminent which can at times rupture the lower anal mucosa causing fissures.This can present as blood along with stools which is what you have been presenting with.
The best way to treat this is avoid dairy products especially at night except curd(which has probiotics in it),you can have good amount of salads at night which helps in a good bulk formation and thus easing evacuation of bowels.
Laxatives are very rarely needed in such cases and try to avoid unless dietary methods fail.
Hope your query has been answered well.
Have a healthy life