It seems like an acute intestinal colitis
. Do not worry, it is an acute problem and it can be resolved completely.
Make sure you do not consume food from outside, no canned and processed food as well.
You can take probiotics for some time; yoghurt is a rich natural source of probiotic. You may take this.
If your symptoms do not improve, you can probably take a course of metronidazole
tablet to take care of any anaerobic infection in combination with Fluroquinolone group of drugs.
Wait and watch for 2 to 3 days. You may then consult your primary care
physician for a prescription of this.
Get well soon.