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Hello, judging by your description, consistent with the clinical manifestations of acute gastroenteritis. It is necessary to go to the hospital, and in addition to symptomatic and causal treatment, the main thing is to actively rehydrate to prevent dehydration and electrolyte acid-base balance disorders. If it is caused by diet, it will get better faster if you fast properly.
Eat regularly, exercise more, and rest well enough. An internal examination is recommended.
There is more blood in the stool than internal hemorrhoids, which is not a big problem, and it is difficult to say in your case, because of the stomach pain before the blood in the stool, it is recommended to go to the hospital for examination.
Weak, how can you get it without eating.
Be careful to pull out the dehydration, it's all like this, you still dare to ask questions, hurry up to the hospital.
If you want to see a doctor, it is not good if it is blood that causes black stool, such as stomach bleeding, it is recommended to go to the hospital for a check-up.