Hello and thanks for trusting me to help you. I am a board certified consultant with over 30 years of experience.
I understand your concern.
Well as you describe,you didn't get relief even after amoxicillin so I would recommend to see your doctor again and undergo urinalysis,urine culture and sensitivity test to rule out underlying infection and causative agent and specific antibiotics to treat it.
If required ultrasound whole abdomen can be advised.
You should try OTC AZO pills and cranberry juice.
Also start vitamin C supplement and multivitamin supplement.
You should take OTC Motrin and Claritin.
Avoid sex practices for a while.
And hydrate yourself with plenty of fluids.
Warm compresses with a heating pad on lower abdomen can be helpful.
Eat a bland diet and avoid spicy,fried food.
Let me know if you have any further query so we can discuss it thoroughly in every aspect.
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