Periods after removal

I was wondering if anyone experienced irregular or missed periods after removal. I had the mirena put in after the birth of my 2nd baby a year ago and taken out for side effects a few months ago. My cycles before were always 23-27 days. I never had a period with mirena after the first few months. Since having it out, I had a period that day, then 20 days later, then 26, then 21. Now it's been 27 days and no period. I never missed a period outside of pregnancy and never had a cycle longer than 27 days.

I am worried mirnea has put me into perimenopause because my estrogen is low according to tests, and my fsh is borderline high (12). I am 35 years old and am battling muscle pain, twitching, weakness, sleeping limbs, fatigue. The crippling anxiety and mood swings have really improved since having mirena out. My bloodwork is otherwise normal and my doctors insist I suffer from somatic symptoms. I have two little kids and am falling a part because no one believes my symptoms are real.