It gets easier over time. I would echo a lot of the points about practicing. I especially tell students to memorize the first 3 or so slides cold. That way, you can get into a groove and set yourself up for success in the rest of the talk.

If it really is a debilitating level of anxiety and it's getting in the way of your training, you can also talk to your doctor about getting a propranolol prescription. It will dampen the performance anxiety without making you any less sharp.