I have pain in area just below the ribcage on the left side that may be a kidney stone that i had 2 months ago that i assume had passed back in early august. what is best treatment for stone and pain?

Here are some ...: If the pain is indeed related with stone passing through left ureter, as suggested by clinical picture and confirmed with imaging study such as CT, the surest step to rid it is intervention through urethra, bladder , up to ureter & kidney. Nowadays, such procedures are very safe and tolerable. So, seek professional attention, evaluation, confirmation, Rx/care, etc. timely. Best wish ...

Maybe maybe not: From your brief description of the pain it's not at all clear that this is from your prior or even from a new kidney stone. It could be pain from the stomach pain from the chest wall pain from the skin pain from the intestines or even other rare possibilities. Brief and mild pain can usually be watched and treated with mild analgesia. And if the pain resolves itself promptly there is often no need for concern. However if the pain persists gets worse or is accompanied by other symptoms such as fever vomitingprompt doctor visit is recommended