Hi Ed and

to the forum,
Is there anything significant to you about this time of year that might be triggering your bouts of depression?
Do you know why you feel the need to self harm? What it represents and what it does?
In my opinion although you may have SAD, self harming in itself although a coping mechanism, is a problem which you may need to tackle separately as well as your bouts of depression.
The separation of your parents can have a devastating effect on the children involved. Especially with those rumours going around. That must have been difficult for you, and turned your world upside down. The effects of a parental breakup can affect the children for many years sometimes well into adulthood. It might be worth exploring if alongside your light therapy, some form of talking therapy might help?
Take care