Hi,
Most likely that your problem could be an acute episode of acute conjunctivitis.
The foreign body sensation is because of tissue reaction of your eye in response to the infection.
Next Steps
You should be starting on an antibiotic drops, such as Ciprofloxacin eye drops or Moxifloxacin eye drops, 2 drops, 4 times a day immediately for the relief.
Health Tips
Even after you use antibiotic drops, if you feel that the symptoms are not relieved ot if the redness is increasing, its better you see an ophthalmologist.