After i finish urinating, i always feel like there's a bit more that needs to come out. so i stay on the toilet and after every few seconds, a few more drops come out. i eventually just get up, unsatisfied. what can be the cause? could it be anxiety?

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!