At this point, in many ways, I am totally obsessive compulsive. (and have gotten diagnosed as much.)
restrictions/constraints about:
what/when to eat
how much water to drink per day, when to drink it
what time to wake up, go to bed
when to answer the phone
all sorts of rituals
they make "life" better, sometimes, in that it provides a false sense of security. and it frees up decision making energy for other choices.
they make "life" worse, sometimes, b/c less variety.