Weird nervous system i cant explain this

[[On...]]

So I just faced eating one of my trigger foods and fears. Sushi. After 4 pieces my heart took off. Then my system was on level 9 anxiety plus fast hr. Then by the 6 piece it was too much my mom telling me its mental. So I flipped on her yelled and just got angry. Walked off, came back. And then was weirdly lucidly calm. Like tired. And my bp dropped to 90/60 and hr leveled out. Ate a couple more pieces and am ok minus worry. Its just like my nervous system was way amped for no reason then way calm for no reason. Somehow explodijg in anger made my bp and hr chill. Weird.