However, I have been getting my anxiety (tightening in chest, throat, butterflies in stomach, dizziness, etc.)
and began researching for almost a year on
perimenopause. The aforementioned website is a lifesaver in that it, at least, explains what you're going through so that you don't feel like it's in your head and you're going crazy. Perimenopause starts as early as in your 30s so don't exclude it.
Hope this helps. God Bless.