I lost 80 pounds with WW now im stuck.

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I have been doing Weight Watchers for a year and half and iv lost 80 pounds. Iv been pretty much stuck the last 6 months. Gaineing one week and looseing the next. Three weeks ago i went off WW and dident count anything at all just stopped when i was full and i lost 4 and half pounds. This week I tryed counting points again and im up about 4 pounds. So i think my body just needs something else for awhile. So I started today counting calories. I have another 129 pounds to go so im hoping this works.