Why the Body Shakes During Anxiety. Shaking is a result of an activated fight or flight system - an evolutionary tool that's meant to keep you safe in times of danger. During intense anxiety, your body is flooded with adrenaline/epinephrine. Adrenaline is pure energy, and your body shakes as a result.
Your doctor may start you on a low dose of oxybutynin and gradually increase your dose. You may notice some improvement in your symptoms within the first two weeks of treatment. However, it may take six to eight weeks to experience the full benefit of oxybutynin. Talk to your doctor if your symptoms do not improve at all within eight weeks.
OxyContin withdrawal symptoms can begin as soon as five hours after the last dose, and can last for as long as a week in duration. The intensity and duration of the withdrawal symptoms will depend on the length and severity of the OxyContin abuse and on other variables.