Kidney stones are common in medullary sponge kidney. Your symptoms are suggestive of passing of kidney stone. Following may help you;
1) Plenty of water
2) Avoid alcohol and caffeine drinks
3) Vitamin C
4) Cranberry extract capsule.
5) Ibuprofen (Motrin).
You may get an x-ray and ultrasound to confirm the diagnosis. Your present pain severity is high which may need an injectable analgesic and hydration therapy (intravenous fluids which push the stone off to bladder form where it can be passed).
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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