I stuttered pretty bad on a work call.

I stuttered pretty bad on a work call. So here is the story, I called the person and had to say pretty basic words but blocked so bad I wasn't able to and got scared and declined the call. After I called him back apologised and pushed through and asked him the questions, now the final part I had to ask him about a word starting with 'p' but I tried to push the words out and I just said I'll call you back in a minute. After this I was overthinking if I should send him a whatsapp, if that would be weird or something but sent it anyway. I am still feeling very heavy in my chest and stomach and don't know what I can do if he calls back. What do you people do when you are facing blocks? I just wanted to vent and thank you everyone who read all that.