“ A baal keri should think about the Shema in his heart [i.e., instead of saying it out loud] and should not recite the blessings, either before or after. On food, he makes the blessing after, but not the blessing before. Rabbi Yehudah says: He blesses before and after. Mishnah 5
If one stands in prayer and remembers that he is a baal keri, He does not stop praying, but abridges the prayer. If he went down to immerse in a mikvah, If he is able to come up, cover himself and do it before he sees the sun blossom – He comes up, covers himself and recites the Shema. ”