Morning.
It may be the start of vaginal atrophy. As oestrogen levels drop the body may become dry: inside and out; scalp, deep in the ears, nostrils, eyes, vagina, vulva .... as well as muscles may become lax = aches and pains.
Appropriate VA treatment is essential. Many find 'vagifem' eases symptoms, I use 'ovestin'. Same idea in that it's inserted into the vagina for 2-3 weeks then as necessary: some require nightly use, others can manage symptoms with every 3rd and 5/6th nights. There are also moisturisers which can help, i.e. 'yes' or 'sylc'.
welcome - browse round, make notes, ask away.