If it was just your acl you would be kinda ok. You have a mcl strain or some damage which is causing the lateral instability. You absolutely can damage ypur knee further. Dont do something stupid and tear your mcl, pcl, lcl, fcl along with the acl. Your seasin is done. Get the surgery now so you can rehab and be strong for next season. I see these injuries every day and would tell anyone the exact same thing.