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Hi and thanks for the query,
Heavy aching legs with cramps usually occurs with diarrhea because when you loose too much fluid from your body you suffer from electrolyte imbalance and muscular cramps. The good thing is your diarrhea stopped you should focus on your nutrition and take good healthy diet to replenish your stores of electrolytes. Oral re hydration salts would help a lot. Take BRAT diet that is banana, rice, applesauce,and toast. You can take tylenol for ache. You would feel better in a day or two.
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