High blood pressure wouldn't help his explosive problems, but having high blood pressure is very dangerous for the heart and he should look into ways of lower his blood pressure. When you went to counseling her felt he was being picked on. So he is someone that can't admit when he is wrong or is very sensitive when people point out his flaws. This could be what is going on. He might be someone that gets his feelings hurt very easy. He doesn't know how to express himself, so he just lashes out. You asked is this a syptom of Anxiety. Yes, mood swings can be anxiety. Anxiety is built up and causes the body to react in many ways. The stress that he might have at work, of certain things in his life. It builds up and the body begins to almost protect itself from stress. You said he is opposed to taking medication. There are many other ways for him to relax to relieve some of his stress. He seems to refusing all help. You tried counseling, he refuses medication. He needs to learn what is going to solve the problem. I know you said it makes things worse to talk about it, but you both need to find the soluntion because you don't want this to continue. He would feel so much better if he was able to get rid of some of those things that really bother him.