My stutter got randomly worse (like it used to be)

My stutter got randomly worse (like it used to be) Hi, i wonder if this happened to anyone, my stutter is pretty severe, but lately, i am more comfortable speaking to people, i have a job where i have to talk with people, take calls and such... back in the time, my stutter was way worse, i couldn't say a Hello, in my language. Today, i got stuck while taking a phone, i could say half of what i wanted to say, then i got stuck and the other person hung up. From that moment something clicked in my head, the next call, i couldn't say a hi, nothing at all, wide open mouth, i had an air, just couldn't say anything, i got really anxious about it, my shift was about to end, so i went home, stopped by grocery store on my way home, again, couldn't say hi to cashier, was so embarrasing.... it felt like i am being rude. Now i am wondering if it gets better tommorow, this never happened to me. Yeah, my stutter gets worse and better, that's normal, but this is not 'usual'.