Leg pain after stomach bug

Patient: I had woke up Sunday night and Monday morning throwing up. I threw up heavily probably 6-10 times. Today my legs are hurting. The pain is mainly on the inside of my legs just above the knee and in the back of my leg below the knee. They are also kind of weak. They dont really hurt unless I’m standing or walking. I know I have been somewhat dehydrated but I have drank several glasses of Gatorade today and ate a banana. Is this normal or should I be concerned?