Is this RCVS? Is CT enough?

Last month I started getting sex headaches and other exertional headaches. I also was feeling more brain-foggy / buzz-headed than usual the mornings after heavy cannabis use.

This week I've had a steady pressure headache all the time that is especially tender/stiff in the bottom back of my head, plus I had multiple extremely painful exertional headaches. I've noticed the steady pressure headache gets more pronounced when I consume cannabis.

I've been a daily cannabis user for the last 7 years.

An urgent care doc sent me for a CT that I've yet to have scheduled ( health insurance hurdles ). A doctor friend told me they believe it's either a Chiari malformation or RCVS.

I fear the CT won't show anything of value for RCVS.

Do folks in this subreddit think my experience aligns with RCVS? Should I go back to urgent care to request more detailed brain imaging (I don't have a primary care doc)?