The phone is a nightmare

The phone is a nightmare I am so embarrassed.It is difficult for me to say hi on the phone nowadays,but flashback to 2-3 months ago it was nearly flawless.How can I communicate more efficiently on the phone and how can I return to a more optimistic mindset?One week ago I had a 40 second block,I just couldn’t get the word out and it nearly eradicated my confidence speaking on the phone.When I pick up the phone I intuitively force all of my breathing patterns,because subconsciously I now view it as threatening.How can I regain my confidence and be more relaxed when speaking on the phone?If I don’t solve this now,I will have huge problems in the future.