Welcome to HCM,
After going through your history it is possible you had small stones on right side ,now you have some uriteric colic
on left side as you suffered kidney stones
,if you have tendency to have stone formation .
Please check with Uro surgeon and get your Ultra sonography
repeated so as to find if you have it some times it is possible clot is there or stricture is there.
You should also check Uric acid and calcium level Urine R&M.
Please take plenty of water and avoid dairy products for time being till you get result of investigations.
Please do not worry if any thing is there it can be treated easily.