SO had a bad dream 😡

My SO woke up at 5am this morning swearing. When I asked what was wrong he told me that he dreamt I had been away for the weekend and I thought his penis was smaller than all the guys that I went away with. He was RAGING! He actually grabbed a cushion and was smacking my head hard with it like 10 times then threw it at me. He told me that his dream confirmed what I really thought. I tried to convince him it was just a dream but he wasn't having it. He got angry and left for work. I am so upset I don't know what to say to him or do when he gets home tonight.