Sensitive nipples hormone issues.

Hi, I'm 44 years old. My LMP was Feb 3. My periods are regular although the flow has been quite erratic, sometimes a little more on 2nd and 3rd day, sometimes not more than a pad. What I m facing a challenge with is very sensitive nipples. I dont have pain. My prolactin, thyroid is normal.in took tests last week. I got a mammogram done last year which was normal. Theres no discharge either. I had pms with breast pain such had been my usual. But the sensitivity continues to be there. I also have a bit of higher libido than normal, and I feel like my hormones are all over the place. I'm more jittery, stressed etc. Am not sure if it's perimenopause symptoms either. Can you pl help as I feel very uncomfortable. Are there tests to check for hormone imbalance?