I totally sympethise with your situation.
If all you need is someone to talk to, which greatly assists in getting your thoughts in order, then The Samaritans are perfect. they will listen without judgement, and help you with support at any time of the day or night - 08457 90 90 90.
If however, you want to try and resolve the family issues, i would reach out to your children, and gain some support from them, and hopefully start to resolve at least some of the issues that are causing you so much pain.