In a large skillet, heat the vegetable oil over medium for 1 minute. Then, add the onion, garlic and ginger. Cook, stirring occasionally, until softened and lightly browned, about 5 minutes. Then add the soy sauce, sherry and sesame oil; bring the mixture to a bubble for a few seconds. Add the raw shrimp and cook for 3 minutes. Then add the noodles and vegetables; toss well. Cook, stirring often, until the mushrooms are fully cooked and the peppers are tender but still slightly crunchy, about 3 minutes.