Hi moonshine 54 ! Sorry you're feeling so low ,it's hard this menopause malarkey. Just know that you're not alone and lots of ladies on here are going through and have been through a similar thing . It sounds to me like it may be the progesterone in the coil, but I would talk to your Gp about this . A lot of women can get side effects or find it difficult to tolerate progesterone, myself included .
But you say it doesn't happen all the time, so maybe it's when your own hormones rise and dip ,because you're still in peri ? You could try increasing the oestrogen and see how you feel . There's a good website called avogel that has information about supplements etc that ay be helpful with mood etc &lots of other information. I hope this helps ,big hugs xx