no clue what to do

I love my bf and i know he loves me too but sometimes I go through fazes where I push everyone away for a day or 2 and need to be completely alone. I've tried to explain this to him but he doesn't really understand and I dont know how to explain it to him. we call during the night a lot because he struggles to sleep and I wake up when I'm on my period a lot and I told him I didn't want to call tonight but he called anyway. I told him I didn't want to try to explain it to him so im guessing im gonna have to today at some point but I have no idea how