OP sorry you are in a rut at the moment. You are not alone, I really do understand how you feel.
Can i just post a few things that have helped me.
I cut people off that were no good to me in my life. This is hard, but I didn't need some people bringing me down more than I was.
I found someone to talk to, I couldn't afford a therapist, she was linked to our local church. Even though I was not even a member of the church she welcomed me. Just talking to someone to get how you feel out, does help a lot. You don't even need an answer back on what you should or should not be doing, just talking helps.
I started exercising as I read somewhere, if you need to work on your mental health, exercise you body. If you need to work on your physical self, work your mind. I started out slow, took a pilates class once a week then signed up for a free bootcamp session after I got into the swing of things. I just felt better for doing it.
I didnt, but there is always medical help available. Your GP could prescribe you something to make day to day things easier.
Lizzie, I came through a very trying seperation and divorce, and yes I was lonely, I had never been on my own before. And then I came to realize that I really wasn't lonely after all, it was all the other things stacked up that I wasn't dealing with, and they sort of let me to think it was loneliness. So then I stopped thinking this and really just started to find what I enjoyed doing again. And somewhere in there, I realized that I am not so bad after all, I actually like me. I am ok.
But just to let you know, now that I have this different way of thinking, its changed me, and just by chance, met someone. I would never have dreamed that it would work out this way as I was very anti meeting anyone, until even recently you will see this on other posts. I think I had to be in the right mental space for it too.
I know you will get through this, but am not denying that is is just easy as waking up one day and all is different. Go easy on yourself. Take care Lizzie. 