What if a huge stone wont dissolve?

Been taking Gold Coin GRass, Curcuma, and Coptis for 4 months now in an attempt to dissolve a 2.8 cm solitary stone. The stone is still there I can feel it. Its an uncomfortable feeling at times but it makes it's presence known. Not pain but uncomfortable.
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2 more months before I have another ultrasound to see if it has gotten smaller.
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If it's small enough I will flush it away.
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If it's still the same huge size then what are my options? Surgery?
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