I am having semi solid stool which looks a little greenish since the past 2 months. During these 2 months, I also once passed a large stool that contained transparent reddish jelly-like strings but they did not change the colour of the stool. Before these 2 months, I had been on a high dose of antibiotics and painkillers for around 30 days for an uti and throat infection. No form of abdominal pain, vomiting, fatigue, rectal bleeding or weight loss is present. May anyone tell me what is causing it?