104 fever after beach fun

Thomas

little man got a fever yesterday after we came home from the beach, he was crying and screaming but went back to his normal self once I gave him some Tylenol. the problem is it's the second day he has this fever and I don't want him to live off the Tylenol. his dr said to come in if it effects him to the point of no eating or drinking fluids. he still eats ok. is this normal to get sick from the beach? it was his first time in the ocean