• just falling out in clumps of love together with your partner
• despair
• overwork, tiredness and sleep disorders
• issues with relatives/children – specially that lesbianism was sinful
• difficulties arising from major mental trauma like rape or childhood abuse
• bereavement – especially the loss of a child if they are living in the same house
• financial worries
• hang-ups from childhood – for instance, if your parents taught you.

…