Feeling stressed moving on

Good morning. I think I may be spiralling into depression over selling my house. We moved here 16 years ago at a time of great stress in our lives and it was a real sanctuary. Now I am divorcing so it has to be sold and I understand it's about more than selling the house. I experienced what I think were mild panic attacks, with palpitations, trembling and nausea when both the valuation and photos were taken. I am crying so much as well and just want to run away till it's all over. My reaction stunned me. I really need to put my big girl pants on and keep going but saying and doing are different things. No one knows how I feel because my kids have their own busy lives. My best friend has remarried and is engrossed in her new life and my other good friend has just lost her dad and is devastated so I am trying to support her. I always give the impression of being happy and capable but I am crumbling inside and would love a hug from my mum but she has long gone.
Has anyone else felt grief like symptoms at leaving their house? It's just a house right? Bricks and mortar.
At 62 feeling unconfident, insecure and obviously shamelessly sorry for my self Any wonderful moving on stories out there to share? Thanks for listening!