I did not know what my tightness in my back was and it has caused headaches for years...but then again with APS headaches they all blended together and I just lived with it. Just recently I found I have a severe degenerative cervical spine issue...and that is the heart of my aches and pains in my upper back and neck. Wouldnt have know it ... as I just deal with the uncomfortable part of it.
I think I would let my doctor know...and they can look into it. Hopefully you have no issues like this but it is better to know this so you can address it. I had a few massages last year and was told that I should not have them with the degenerative issues as it can make it worse right now.
Better to know it isnt something else.
Best of Luck to you....