Fear of public speaking has nothing to do with your personality -- it is just like, say, fear of heights. Doesn't matter if you are shy or not, confident or not.
Oh, boy, did I have this problem. It was terrible. I had stage fright, not once, but twice -- and after the second time I vowed it would never happen to me again, and it hasn't.
What I found has worked -- practice, practice, practice, practice what you are going to say. Do it standing up, facing yourself in a mirror, preferably in a large and open space (like outdoors, even), and/or preferably with an audience (like you!), and get all your nerves out that way. Try to anticipate what questions will be asked and the ways you will answer them.
If your husband can have access to the room in which he will be speaking, even better. Like, after hours, maybe he can chat with security to open up the room for him so he can practice there, get himself used to the way the space feels, how his voice sounds in the space, etc. I have done that a few times and it worked very well.
And when I say practice, I mean -- I have (and still do) spent hours, like 4-5 hours, literally practicing what I will say until I practically have it memorized. I have found that the more familiar I am with my speech, the less likely I will unravel if I get up to the podium and I feel my nerves settling in.
Another tip -- speak deep and slow. Like, when I feel myself getting nervous I slow my pace to what feels sort of awkardly slow to me, but to the audience it does not feel that way, trust me. It helps slow your heart rate. Also, even if you are stumbling a L., speaking in a deeper voice sends a message of confidence, so the audience is less likely to perceive that you are nervous.
Finally, bring water. If you get nervous, the mealy-mouth texture of a dry mouth from nervousness will not help. Pausing to take a sip of water will help you relax.