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.
However Oxycontin has an apparent elimination half-life of 4.5 hours compared to 3.2 hours for immediate-release oxycodone. It takes about 5.5 x elimination half life for a medicine to be cleared from ones system so it may take 24.75 or 25 hours (5.5 x 4.5 hours) for Oxycontin to be cleared from your system. https://www.drugs.com/pro/oxycontin.html.