Bipolar Disorder Support Group
Bipolar disorder is not just a single disorder, but a category of mood disorders marked by periods of abnormally high energy and euphoria, often accompanied by bouts of clinical depression. This is the place to talk about your experience with bipolar disorder, learn from others' experiences, and find support.
I'm glad you have a period of adjustment with the half-days, and I hope it eases you back into the environment so you will be comfortable taking up where you left off.
As far as explaining - or not - "why" you were gone, I have no advice, but I'm sure that would be daunting at Best. If you were there a long time, that should help - people "know" what you were capable of before, and "know" you are likely still You.
I'm sorry for all the loss you have experienced; best of luck to you.