Worms in stomach. Take and for how long?

I'm facing worm problem since more than 1.5year I get anal itching at night when I eat sweet , sometimes even saliva comes from mouth in sleep. I also get pain in left side of the stomach . I have low immunity, I have lost weight as well. I must have taken albendazole 7-8 months back once or twice. I  took mebex for 3 days in the month of Feb and then again I took Mebex for 3 days in the month of July. After taking mebex I get relief just for a month or 2 and again I face the same issue. Last month I shifted to ayurvedic medicine ( krunikuthar ras which I took for a month with vidangana, when I took this... I had relief ). It's like till the time I have medicine, I'm relived for time being. I want to get this treated completely. What medicine should I take and for how long?