Hi
Wellcome to health care magic..
I have read your query in detail and under stood it properly, I will try to use my expertise to huide yiu through the issues you mentioned.
1ST thing 1st there us very little conection between flu and
diarrhea specially bloody diarrhoea(
dysentery) but yes there is connection between the body aches you have and makformed painful stool you have which progressed to bloody diarrhea.
The symptoms you mentioned : Body aches,muscle pains, abdominal pains cramps,
lethargy,painful bowel movements leading to BLOOD with MUCOUS is typical sign of amoebic dysentary ...
GOOD NEWS: It's very much treatable with an Amoebicid like
metronidazole and a
spasmolytic drug which would relieve your abdominal cramps and you will be all fine,up and running in a couple of days.
If i were your physician i would have Metronedazol 400mg thrice daily for five days. For Body aches Tylenol over the counter can be used.
-Should you rush to ER? Yes!!if you cant get your hands on metronedazole over the counter..!!
Hope i covered all your queries , if you futther have questions we here at health care magic are happy to help.