Thanks for providing more information.
As you describe,frequent urination,pain during urination,lower abdominal pain can be caused due to Cystitis,Urethritis,Renal calculi.
Constipation can be an aggravating factor.
So you should drink plenty of fluids and take Metamucil.
Also take OTC Simethicone for bloating.
Now as your OTC UTI test is negative however you have symptoms and even Celebrex,tramadol don't provide your relief so it is advised to undergo repeat Urinalysis,Urine culture & sensitivity test and Ultrasound Whole abdomen.
In my opinion you shouldn't ignore your symptoms and make an appointment with your doctor for further evaluation and management.
I hope this helps.
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