Could The Feeling Of Masturbation Be Due To Hormonal Changes?

I am a 45 yr old women and have started to masterbate sometimes up to 5 times a day and i could do with more but feel too tired. I have been married for 27 yrs and have had a pretty normal sex life. (1-2 TIMES A WEEK) I married at 18 and have one sexual relationship. This has only started recently. My periods are now quite irregular. I recently had my hormones checked to see if i was pre-menopausal but my estrogen levels were high and my doctor said i wasn't pre-menopausal and said i was very fertile. Could it be possible i could have something hormonely wrong? Should i go back to my Dr and get her to check for something else.