First and foremost, you need to take a pregnancy test now. Be sure to rule out that option. You need to get the IUD out if you are.
I have experienced everything you have mentioned and then some. It is normal to have your nipples feel like that off and on for a couple of months. I even had little drips of milk after 6 months, it was crazy. You were nursing for a year, it takes a while for your body to adjust.
As far as the period thing. That is just an unfair freak of nature. After my first son, I didn't get a period for 1 year after I stopped nursing, it was great. My second son, I got it within a month or two after I quit nursing. Then here's the kicker - with my daughter, I started my period when she was 6 months, I STILL NURSED HER FOR 6 MORE MONTHS. Totally unfair! In short, it is all normal maybe just not typical.
Good luck and no worries!