Sorry to hear about your anxiety and worry.
I can relate to this as I went 2 years with no breast swelling, aches , etc... All of a sudden this last month they started hurting. It's because of hormones, the more you stress, the more the hormones can race around and cause all sorts of unexplained pains.
These things are common before, during and after the menstrual cycle.
We will never have the same period symptoms through out are lives, one year you might feel pain, the next you probably won't ;-)
Body is fascinating haha.
Don't worry :-)