Hi ChannelGSW,
I’m glad to hear that things are improving and it’s not unusual to see this while you are going through the break in and adjustment period for a new mattress (see post #2 here).
There is more about the more common “symptoms” that people can experience on a mattress and some of the possible causes for them in post #2 here. In very general terms … a different pillow will usually be more effective with upper body symptoms (neck, shoulders, and upper/mid back).
A pillow under the knees for back sleepers, in between the knees for side sleepers, or under the hips/lower abdomen for stomach sleepers can also help maintain the spine and joints in a more neutral position and is well worth trying for those that have lower back issues yes.
Phoenix