I agree with a lot that has been said here.

Withdrawal is not easy. There are things that can alleviate it. I've heard that the first week is the worst. Although, I know that the symptoms of withdrawal can and do last longer than a week.

Withdrawing from drugs can definitely be dangerous. I had a family member who got really sick from withdrawal from alcohol.

It might be worth it to discuss things with your doctor. They might have some suggestions on how to help with the symptoms. They, also, might be able to suggest treatment centers that you can enter into in order to get help for the addictions you have.

Best regards.