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Cover noodles with boiling-hot water and soak until tender, about 7 minutes. Reserve 1/2 cup soaking water, then drain noodles and transfer to a large bowl.
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Meanwhile, heat 1 tablespoon oil in a 12-inch heavy skillet over medium-high heat until it shimmers, then cook pork with garlic, stirring occasionally and breaking up lumps of meat, just until meat is no longer pink, about 3 minutes. Transfer to a small bowl with a slotted spoon.
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Add remaining tablespoon oil to skillet and cook onion and bell peppers over medium-high heat, stirring occasionally, until just softened, about 3 minutes. Return pork to skillet and add curry powder, then cook, stirring, 1 minute. Stir in 1/4 cup reserved water.
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Add pork mixture to noodles along with fish sauce and herbs. Toss to combine, adding more water and fish sauce if desired.