Misophonia is destroying my family and social life.

Hey, Im new here but I feel as tho i might have misophonia (self diagnosed) Because every time i hear someone chewing or crunching or even breathing it en-rages me so much to the point where i storm out of the restaurant or want to turn around and punch the person in the face. My mother CONSTANTLY chews with her mouth open and crunches popcorn REALLY loud and when i told her to stop because i may have misophonia she said "Thats not a real thing your just trying to get away from me and im not even crunching that loud". Drives me NUTS. What are some ways i can stop from getting en-raged by these noises? Thank you in advance guys and girls.