You have identified your problem very well.
Less water intake is responsible for many of the symptoms mentioned above.
But little more information & few investigation are required to diagnose your problem.
Next Steps
Please consult with me online for further guidance
Health Tips
Drink plenty of fluids coconut water, butter milk, lemon water etc..
Take nutritious and high fibre diet... including green leafy vegetables, salad,sprouts, fruits etc... Avoid food rich in oils / spices,maida etc.