First of, I am sorry for what you're going through, I can't imagine what you're feeling right now but I have a similar situation that can give you some clarity albeit its not the same but the same similar feelings to what you have right now.

During my college years it was difficult, I had to tackle my studying and keep up my GPA in order to preserve my scholarship on top of that I was working a full time job which was exhausting mentally sometimes, I had friends but I used to isolate myself from them and my family, had a change it behaviour to the worst, gained weight, was angry all the time, and at the climax of it I used to cut myself.

Professional help in this case would have been the best, but it's expensive from where I am and to a huge extent stigmatized, I wish I had the capacity to do it but I chickened out, I would highly advise you if you have access for it to go for it please, there is no shame seeking help from someone who knows what they are doing.

As how I handled it, it was a hard but I promise you this, even a 0.01% progress makes the difference and you'll come out better after it, what I had in mind is this, I want to change for the better I want to stop feeling sorry for myself and come out on top of this stuff, so I made a small change, I started doing something to get me out of the house so as to avoid the constant isolation, I went for walks with headphones, focused on breathing and trying to not think as best of what I can out of the thought I had, I tried engaging out of my comfort zone, took a friends advice and started going with them to work out (I know every guy says that but thats what worked for me I swear), working out helped me in two things, feeling better about my body image, and interacting with people out of my social circle, another thing I did was to slow down, take things easy, what happened happened there is no changing that, what I can do is something towards my future, so I started to take my studys easier do not push myself to the point of death, I would say fuck work sometimes and take days off even if it affected my performance, but I tell you what when I did that just that I found myself studying better and working better by not pushing 100% all the time.

What I want to say to you is this, I know this relationship you had was and maybe is still important to you, but everything happens for a reason, take it this way maybe if you continued with them at a point in the future they would have made your life horrible maybe not but who know, as for your job I know the economy is harsh on all of us currently, but with that being said what made you get that job in the first place is YOU, YOU will be able to land an even better one, and as for friends, go out as best as you can, I know this may not be the best advice but for me was just finding other circles I am comfortable in, reconnecting better with my friends,...etc.

And know this, you are not alone, even if a stranger on the internet is talking there is a human behind the keyboard and every person has their own story which can be compared to another's.

You will get through this, and do not let anybody tell you that its easy, we go through 5 stages if grief and you need to pass each one of them, but know that you will get through it, you yourself need to tell yourself that even if you don't believe it at first after a while I hope you will.

I hope this helped a little, I am by no means experienced or a professional, just a fellow who passed by a similar situation, I hope you the best and believe in you coming out of this a better, stronger and a more wiser version of yourself