Desperate for Help with Impulsive Verbal Vomiting

This is a longshot but I'm desperate at this point and I need help before I manage to ruin my relationships. I really need to find as safe place to write out my thoughts where I can let them sit for a day before I can share them. Like a digital diary with a timer as a lock. I can't stop my impulse of verbal vomiting when I'm upset but I end up doing it in long text spams or emails and sending them out before I can think better of it. Sometimes what I write can be helpful but I need time for it to sit so I can better decide if it's worth sending. It's become a true source of major struggle all around but I can't force myself to stop. I need help. Another thing I need is a program with a word input limit (like what Twitter has) where I can write things out and create multiple posts but also have a limit to how many posts to the thread. I need this so I can draft up texts without them becoming rambling text storms that overwhelm the reader. If the limits can be customized it would be perfect. Like I said, I know it's a longshot and these things would be temporary while I retrain my brain to automatically be able to sense the limits. But for right now I'm spiraling and I truly need something to help me. I'm open to suggestions (though I swear I have already tried a great many things to no avail). Maybe someone knows a coding genius with a kind heart that feels altruistic toward people who suffer from the burdens of their mental health issues who is also bored and looking for a way to flex their talents? Please, I am begging. I can't keep doing this but I don't have the ability to stop myself even knowing what's at risk. I've been trying. Please.