Is it PTSD, ASD, or intermittent explosive disorder?

Got a question for you all: My husband has PTSD from childhood and he is 81. He has been through medications, therapy, nothing helps much. The symptoms have remained the same over 28 years of marriage. I believe he is also somewhat "on the spectrum". Can you tell me if these anger episodes are PTSD or spectrum issues?
1) Yesterday my husband was working in the garage with pants that were too long, dragging them on the ground and I was afraid he would fall. To me, this was a safety hazard. He left for a few hours and I decided to wash the dirty pants and hem them up so that they wouldn't drag on the ground. He persists in wearing canvas slide shoes that cause him to shuffle, so this made it worse. He came back and decided to mow the lawn, and learning that his pants were in the wash he flew into a rage and ripped all my clothes out of my close, breaking all the hangers, and threw them in a garbage can in the garage. He yelled for almost an hour, screaming at me that I took his only pair of work pants and he would not allow me to explain my reasoning.
2) Today he is going to a 12:30 doctor appointment. I had been communicating with a county employee about hauling away our old water softener. At 11:30 the employee said he could pick it up today. It's a very heavy appliance and I cannot take it to the curb by myself. I said, "The guy can pick it up today." My husband flew out the door in a rage and ran to the garage and started trying to find the hand truck, realizing the tires were flat and so he began pumping them up. Then he ran around in angry, screaming at me that he didn't have time for this and how could I do this to him. As I tried to help him, he lifted the handtruck as to throw it at me (I doubt he remembers this), screaming angrily. Unknown to me, he had decided to make a couple stops prior to his doctor appointment (I thought he was shopping AFTER his appointment). "How can you do this to me? Now you have ruined my day. You should have asked me." In my mind, he could have just said to me, "Today is not convenient as I have plans, can you reschedule the pickup?" This falls in line with his inability to negotiate schedules in his life. Very inflexible and cannot discuss or think of a third solution to problems. Outside of life management, he is a brilliant jazz musician and computer engineer, so he is very creative outside of interpersonal negotiations. Anger episodes happen about every 6 weeks, unpredictably and sometimes corresponds to physical pains (injuries). Since I've know him, in anger he sometimes rents his clothing. Since his abuse was from the ages of 10-12, many reactions are automatic, such that I am his evil stepmother in real time. But other aspects of behavior seem linked to autism, such as a poor understanding of personal space (cannot tolerate anyone in his visual field or negotiate around people in his way), or inability to distinguish faces on television but at the same time noticing extreme detail in the background. Outside of episodes, he is a wonderful, loving husband. After each episode, it vanishes from his mind and he's fine. Just like vomiting anger and he's done, leaving me in the aftermath. I've learned to move on, but I have become anticipatory of random events outside of my control. I don't know what will set him off. Is this typical of living with someone with PTSD?