Everyone is different but what you have said has rang too true for me!
I was on the ring beginning at the end of January. After about the first month the headaches started. By the end of the third month I was living on motrin, midol and aleve.
Bawling for no reason, yeah I had that too but it got worse...
I began having severe mood swings. I would throw pringle cans against the wall shattering them, I broke a phone, a large cordless one by throwing it against the wall. I felt badly for poor Pan. I would scream insanely at him for the most minor things or things he hadnt even done. I scared the poor man half to death and while I knew what I was doing was wrong I felt no remorse.
Not to mention the nearly 100 pound weight gain that I am now losing! (After having lost 133 pounds before using that damn thing.)
I have been ring-free since September 29th of this year and the headaches are gone, the mood swings dont exist anymore and I no longer feel like I am going to have a nervous breakdown.
It was definately the ring. I loved the shot with all my heart but I have used it for 2 years already and any more than that can cause bone loss. So December 4th I will have a uterine ablation to destroy my uterine lining and my tubes will be tied and I will (hopefully) not have these problems ever again!
Hope this helps to know someone else went through it, and what I did to fix it.