I am having difficulty in passing stool.i had a glass of lemon juice mixed in hot water.what should i do?

Two answers.: Short term- use bisacodyl, enema or manual disimpaction. Long term-need explanation for this and prevention of further episodes. Drink plenty of fluids and eat plenty of fruits and veggies.

Constipation cures: Sounds like you're reporting constipation which can be described as decreased frequency and/or hard, difficulty to pass, stools. Natural methods include more fiber (aim for 25-36g/d), plenty of fluid (water, not alcohol or soft drinks) & regular physical activity. Stool softeners & laxatives are available over-the-counter but avoid taking regularly or else your bowel will become used to them.