I feel like I'm gonna throw up but I'm terrified what do I do???

Throwing up is my biggest fear and I really feel like I'm going to. I haven't in years (maybe 3 times since I was born, and I'm 18). I cry nonstop if I feel like I'm going to which is what is going on right now. I tried pepto, ginger ale, ginger candies, and anti motion sickness bands and nothing is working. It's a really awful phobia. Please help what should I do??? And if I throw up how should I handle it??