Hi, so this one may be more mental health than anything but i have suffered two sexual assaults and i have experienced psychosis and delusions since those days and it affects my relationship with my boyfriend whenever i go through the delusions. why?

Post traumatic stress disorder is likely and at a minimum you should have a counselor or psychologist that you can see regularly. In case you do not have one start with your pediatrician than can further coordinate locally.

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!