Joints pain. Follow up getting normal!

I am feeling low back pain last 2 years HLAB-27 neg MRi bone scan was normal 2 year before, In last two year crp always normal ESR always just below to higher limit , i am following rhumatologist continuously , till now my diagnosis is carried out as fibromyalgia BJHS , My pain is limited to lower back , just below knee joints, initially pain was also in foot ankle finger of leg but that is 100%relived, now I am taking pregab D , I observed my pain reduces in winter and increase in summer, I read on Google that fibromyalgia causes widespread pain but I have no widespread,pain only triggers episodic in lower back and buttocks now I want to know can without increasing in inflammatory markers can AS happen Ra neg Anti ccp negative Ttg neg Ana neg ENA neg Triple phase bone scan normal Mri si joints normal Above test carried out in 2022 ESR CRP every follow up getting normal