Disturbing thoughts of myself dying

This year has been a pretty tough one for me, I just started my first year of uni (which I'm not enjoying), after going through two years of treatment for cancer. I struggle with social anxiety and occasionally go through periods of depression, but recently I've started having these really graphic thoughts of myself dying. Not suicidal thoughts of wanting to die, but just images that randomly pop into my head of myself dying in various ways. The past two weeks I've had reoccurring thoughts of me standing against a wall and having knives thrown at me like a dart board, and today I had an image of me falling and being impaled on a metal rod. These thoughts are pretty disturbing and are becoming more frequent. Has anyone else experienced anything like this?

Under review.