I have had it happen. It was longer than that - a bit more than a year of normal and hypomania. It was fabulous.
It was before my BP diagnosis and I 100% believed I was fine. I attributed previous problems to my abusive marriage. (the year of normal happened immediately after getting divorced)
I came out of it from too much stress in my life. I was DEVESTATED! I was already with my SO and so afraid I would lose him.
Presented first with panic attacks. I started seeing a pdoc and tp for that. Pdoc put me on paxil, triggered mania and got the whole cycle going. My tp figured the BP stuff out 4 - 5 months later and I finally got dx and the right meds.
I'm so happy you and your family had a few good days. And so sad it was gone so quickly! I think as BP, we have to grieve the life and opportunities we have lost. Are you depressed? or greiving? or both?