Both drugs are covered in our 'Other Drugs' section and you can find that here - if your looking for specific information on the withdrawal side of things then check our our 'sober living' section here as I'm sure somebody can help you out.
Please be very careful with xanax withdrawal and do not just stop taking them cold turkey. If you have a serious habit then you really need to taper as just stopping can lead to seizures and can kill. (more detailed information can be found in Sober Living)