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You are likely suffering from a viral infection of your gastrointestinal tract at present. But this is unlikely to cause your rectal pain. The more probably cause is Proctalgia fugax which are rectal spasms. However before diagnosing this condition you need to visit your doctor who may conduct an anorectal exam. If the exam is negative and is not diagnostic for any other condition than the possibilities of proctalgia fugax may be considered. This is a sporadic pain in the rectum caused by spasm of a muscle near the anus.
However this is not an emergency unless you are getting this frequently or have abdominal pain, which would prompt for a visit to the ER. Please mention this next time you visit your doctor.
Now you may take tylenol for the fever and also take enough liquids and oral rehydration solution to avoid dehyration.