Hi Heidi and welcome to the forum.
Yes,I've had the weight gain,falling oestrogen levels mean we can't burn fat the same,especially around the middle,it's infuriating for me,I'm fairly slim but have this "belly " also re the painful nipples,again,fluctuating hormones,for about 6 months every so often mine were so so painful but again it was hitting menopause,I've not had it again since.