Cure for masturbation

Q: I started pleasuring myself since I was 12. I didn't know what it was up until I was 13/14. It eventually turned into an addiction so bad that sometimes I did it in school. I tried really hard to get rid of this sinful habit by asking for Allah's help but eventually would slip into the sin. This sinful habit ruined my life, and I don't want it to ruin my life anymore. Also I've missed many prayers due to this sinful addiction. Am I supposed to make up those many prayers I missed? If yes, how should I do it.  Please give me advice on how to stop this addiction and please make du'a for me and for all brothers and sisters with issues whether it is the same issue as mine or not.

Taweez

Q: A mufti gave me a taweez to burn with numbers written on it. What do you say in this matter?