Waterslides - how to overcome fear?

Help please? Am going on sun holiday next week and my husband really wants me to go on a waterslide with him. He is an expert swimmer and I recently learned to swim after 30 years of being petrified of water. I am not a strong swimmer at all. I don't think I would mind going down the slide - its the actual sliding into the pool at high speed that terrifies me. I know these pools are only hip high but i freeze when i look at them. Please can somebody help me, i really want to do overcome this fear. All tips appreciated