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You could be having Urethral syndrome
where there is no infection but severe pain. The reason is intermittent spasm and narrowing of the muscles of bladder and urethral sphincter
causing inability to relax and severe pain. The cause could be due to bladder interstitial cystitis
which won't be shown in urine test and needs cystoscopy. It could be due to nerve irritation
also. It is associated with anxiety, depression and seen in women of 13-70 years of age. Eat plenty of fresh fruits and vegetables to ankalinise the urine and reduce symptoms. Treatment will include proper diagnosis first, following which anti-spasmodics, muscle relaxants, anaesthetics will help. Consult your Urologist
on these possibilities as there are many ways to relieve your pain.