being ignored triggers TF outta me

so all in all, yes i know this is something that really only a therapist can truly help with but i’m just curious if anyone else experiences this and what it stems from or anything. i am in therapy and have a psychiatrist but i just started so i haven’t really gotten anywhere with it yet. about a year ago i got out of a toxic relationship and i noticed a big personality difference in myself. i became extremely quick to snap and very little impulse control. my biggest trigger is being ignored. mainly with my ex (we have a son together so we have to communicate) but it does occasionally happen with other people. me and him have had a pretty rocky, on and off relationship for almost 4 years. i usually get triggered if we’re mid convo and he starts ignoring me, mainly if it’s something i feel is important to me. it’s embarrassing to even talk about and i haven’t told many people but it triggers me so much that i will completely blow up and i can’t stop myself. i will call 10 times, text 30. i will say mean things. in the moment, i don’t care. once i’m finally able to control myself and my emotions i’ll start crying. this happens every single time. i will bawl my eyes out because i’m so embarrassed and this isn’t like me. it’s like i have no control over my own thoughts/emotions/brain. i am so tired of this because regardless of the relationship with him or anyone else, i want to always try to stay cordial with people. i always apologize after these blow ups but they happen probably once a week and it’s really beginning to strain relationships. i feel like i’m losing my mind because it feels so out of my control. please be kind. if you have any advice or personal experience with this, please share! thank you