Did it stop working because you built tolerance? If you take cannabis regularly, it will become less and less effective. Taking two days off between doses is often enough to avoid tolerance for most people. This means there are fewer days with the relief it provides, but it also means you will be assured of relief every third day. Some people also alternate strains, using varying strains of Sativa and Indica to avoid tolerance, and some people are micro-dosing to avoid tolerance.