Dreaming about being capsized means you expect the worst possible outcome where you are unable to overcome. If you are working on a big project, do not approach it by yourself because it may overwhelm you. There is strength in numbers by bringing your colleagues onto the project. Best to seek the help of professionals who have more experience.
If you were to dream about being capsized while on a boat, then this may signify that something bad will happen in your life or that you have been neglecting your responsibilities.
It could be that your subconscious is reacting to a current situation where you feel like you’re drowning in work or drowning in personal problems.