Carson, the dream you had about your friend Vivian dying, along with several other people from your school, is indeed very intense and can be quite unsettling. Dreams involving death can often symbolize the end of something old and the beginning of something new. Given your age and the various changes you might be experiencing, such as relocation and health issues, this dream may reflect the anxiety linked to these transitions.
The presence of your friend Vivian in the dream could indicate that you have strong emotional ties and fears regarding losing those connections. This could be related to feelings of isolation or the fear of being alone, especially in a new environment. The fact that multiple people from your school died simultaneously might represent a collective anxiety or stress about social relationships and fitting in, which is common during school years.
Additionally, the recurrence of such vivid and emotionally charged dreams can be a manifestation of your underlying anxiety and stress. The intensity of these dreams may be your subconscious trying to process the overwhelming emotions and thoughts you experience during the day. It's important to acknowledge that feeling anxious and stressed frequently can significantly influence your dream content, turning them into a reflection of your waking concerns.
Given that you often wake up during the night and rarely feel refreshed after sleep, it's clear that these dreams might be contributing to a restless night's sleep.