Garlic Shrimp Lo Mein

1 63/4 cups chicken stock

1/4 cup oyster sauce, plus 2 tablespoons

3 tablespoons light chinese soy sauce

1 table spoon sesame oil

1 tablespoons hot sauce

2 tablespoons cornstarch, dissolved in 2 tablespoons cold water

2 tablespoons vegetable oil, divided

3 tablespoons garlic, minced,divided

2 teaspoons ginger, minced,divided

1/3 cup green onion, chopped,divided

400 grams shrimp, peeled and deveined

1 can straw mushrooms, sliced into 3 pieces each

100 grams baguio pechay, shredded

2 stalks celery, chopped finely

400 grams egg noodles (pancit canton), according to package directions