Yeah, unfortunately, it definitely can’t happen that it takes longer than 72 hours, but it’s a good call to run it by your doctor.
Also, there is a clear yet complex relationship between bed, sleep and headache, so seems like a good plan to explore this a little bit further.
As for the stretch exercises, I couldn’t find the perfect video online, but there is an adequate one. I will share with some footnotes. youtu.be/MI9o8SOxldY
I don’t really like the commercial tone of the video, and I have never performed stretch 2 (but number one in the slightly altered version of number three really work for me). The way I do number three differently, is that after tilting my neck sidewards, I then proceed to tilting it forward, whilst still tilted sidewards, if that makes any sense. So first tilt it all the way to the side, then proceed to rolling it forward without tilting it back to center. While doing this pay attention to the shoulder on the other side, making sure you are not lifting it. You should feel the stretch on the side you’re not tilting to. Feel free to send me a PM if you still have questions about it.