Have you ever heard of anyone dying from a tantrum? No? Good. Point is: your MIL will not die if she throws a fit so when she does, ignore her and stop acting like her tantrums are hurting you. Rearrange the mindset and understand that she’s only hurting herself.
Have you ever heard of tantrums solving any problems? No? Good. Because that is not what I meant. If you throw a fit in front of your husband and MIL, who’s getting the boot? You are. So don’t do that.
Standing up for yourself doesn’t mean screaming and yelling.
It means being stronger and not allowing bullies to bully you. If someone was treating me the way your MIL treated you and I **wanted **the marriage to work - I’d play just as dirty as she is.