I was injected with a serum that will kill me shortly via heart attack.
This dream may indicate that you are feeling anxious or overwhelmed about something in your waking life. It may also suggest that you are experiencing fear or worry about a situation that you feel is beyond your control. The injection in the dream could represent a sense of powerlessness or a fear of dying. It is important to take note of any current fears or stressors in your waking life and find healthy ways to cope with them. This could involve seeking support from loved ones or speaking with a mental health professional.