Thanks for this question and im sorry to hear about your symptoms. The symptoms which you are describing can be consistent with a UTI first of all. This can cause the sensation of incomplete emptying as well as the frequency and also pain while urinating. This is the most common cause for symptoms like these. Other symptoms can include dark colored urine, burning urination, odor to teh urine etc. The diagnosis is fairly simple with the help of a urine analysis and a culture. The treatment is with increased intake of water as well as antibiotics. Antibiotics usually clear up the problem within a few days.
ANother cause of this can be cystitis. This is inflammation of teh bladder which can occur due to an infection or due to other causes. Again an infection is the most common cause here. This again would need urine tests to be diagnosed however an ultrasound would also be necessary here. The treatment is again with antibiotics. There is a form of cystitis which is known as interstitial cystitis. This is actually due to an autoimmune cause in which you would have symptoms of a UTI/cystitis but wont have an infection. This would present with WBCs in teh urine without any bacteria. The diagnosis is made with a cystoscopy and then treated with steroids among other drugs.
Yet another cause of this can be an obstruction in teh urinary tract because of a small stone. Stones can get stuck anywhere in teh urinary tract and in partial obstructions you will be able to pass urine but with obstruction. Bladder stones by themselves can also cause these sensations. This again would need an ultrasound to be diagnosed.
My suggestion would be to get the above tests done when you visit your doctor and in the meantime increase your water intake as that does help in many cases.
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