Warning: Story about the death of a child

Recently witnessed, firsthand, the death of my almost one-year old sibling. I keep experiencing auditory flashbacks(?) such as my mom's screams, extreme anxiousness when I hear sirens, random bursts of anger or crying spells, and several nightmares involving my sibling. Invasive thoughts are also common about the night it happened, but I'm an anxious person so anxiety isn't anything new.

Considering the event is recent and unexpected and tragic, I'm aware I could just be experiencing symptoms of grief; but also I can't get into any sort of therapy session for possibly a few weeks to a month so medical marijuana could be a solution until/alongside therapy.

In your best judgment, would I qualify for PTSD under the symptoms given or is it really up to the medical professional?