Both your anxiety and your medication (a combination of paroxetine and clonazepam) can cause restlessness and weakness. While anxiety itself often triggers physical tension and fatigue, these symptoms can also be side effects of the medication, especially with long-term use. Sometimes, your body can adapt to the medicine, or subtle changes in how you take it can cause these sensations. Please do not worry, as this is a very common and manageable issue. It is important not to stop or change your dose suddenly, as this can worsen symptoms. I highly recommend discussing this with your prescribing doctor, who can safely evaluate your dosage and help you feel better.