Don't have anxiety but if need to public speak i get anxiety days weeks ahead of it, not always unpredictable what can b done?

Cognitive therapy: You can work with a psychologist who does Cognitive Behavioral Therapy for this kind of anxiety. Public speaking anxiety IS a type of anxiety, even though you say you don't have anxiety. This therapy can be very helpful. Some people also find benefit in using beta-blocker medications such as Propanolol at low dose, to block peripheral symptoms of anxiety while speaking. Your physician can help.

Develop confidence: If you are the speaker consider yourself better informed about the subject than your audience and it will help decrease your anxiety High light what you want to emphasize i call it a cheat sheet Good luck