GinBunny, I hope you're ok. It's a very difficult time for you. Be kind to yourself and don't expect too much. That's what people told me. I didn't understand what being kind to myself meant, but I soon learned that it's a matter of doing small things that bring some comfort to you - hugging your pet, reading a book, watching mindless TV, going for a short walk, taking a drive, going to the library, etc. Slowly does it. Your mind is going crazy now, but it will start to slow down and you will start to process everything. You need to do whatever is best for you.
If it helps at all, I am 8 months down the line, having been with my ex-P for over 30 years. We are no longer together and it was absolute hell when we broke up. He was unfaithful many times and it was a very difficult for me to cope with. I stayed in the relationship too long, and now at the ripe old age of 50, I am getting to know myself and living the way I want to live.
I don't have any friends where I'm currently living. I know people, but not enough to unload to. Fortunately, my family, who live in another country, have been great and have helped me through. I have really had to push myself to move forward, as I know it's the only way to have a good new life. I made a decision that I would not spend the rest of my life being depressed and regretful.
Go and see your GP. Please consider seeing a counsellor, as this will help you to make sense of everything. Call Samaritans now. They can't change what's happened, but they will help you just by being able to talk.
I haven't posted on mumsnet before, but I couldn't pass you by, as I know how awful this is for you. I cannot emphasise how much lurking on mumsnet has helped me through the last 8 months. I really had no idea how many people are suffering through their relationships, and this has helped to reassure me that I'm not alone and, in fact, how many people have so much more to cope with than I have.
I promise you that you will feel better soon. I didn't believe people when they told me this, but now I do.