Drinking lot of water is not solution for all. Your bladder is already not able to retain fluid, & trying to throw out of body asap. Give it some rest by avoiding lot of water intake. Take Gokshura churna with Shwetha parpati.

You may be suffering from cystitis. Avoid spicy fried and junk food. Avoid tea coffee and aerated drinks. Take some urine alkalizers and antibiotics for five days. For better results Apply hot fomentation over lower abdomen.

According to your symptoms it shows that some obstruction while urinating and inflammation of bladder may also present. I suggest you do R/E of urine and Culture of urine and also Do USG of lower ABDOMEN. Frequency of this inflammation may get worsen the case. I suggest you that consult good homeopath doctor for treatment.