Hope you are ok. Dont be ashamed to admit your an addict. This is a major step now in your life to being clean, and it will help you to beat your addiction.
Ive got my own addiction to coke that im trying to beat, and i dont have much knowledge about painkiller addictions. But to help me control mine were im only using once every few week. Ive took up hobbies to keep me occupied, things like reading, gym, decoarating, board games with the kids, walking the dog in forrest with the kids.
Try and do some new activities. Have some goals and believe in your self.
When you wake up in the morning, tell yourself i am just going to stay clean for today, dont worry about the week ahead.
With prescription drugs im not to sure if you have to ween yourself off. So just drop your dose again for a week. Then so on. Then none.
Im so sorry to hear about your mum, dad and brother. This has obviously has effected you and could be why you use. I personally would get some councilling or something like this to help you cope with everything you have been through. Its bad enough losing 1 family member. But to lose 3 must be heartbreaking.
Also there is a good app called pocket rehab. Its basically like a forum for all addicts and ex addicts. It has a wall like facebook, and everyone writes about there addiction. There are alot on with prescription drug addictions aswell. You get good advice off ex addicts aswell. They are great friendly people. There is also a lifeline button, which you press if you are struggling and it puts you through to another addict and they talk to you and help you. I cant reccomend it enough