The first two practical things I would advise are, well there are 4 really:
1 go to your doctors for a check up - blood pressure, cholesterol, iron, etc (make sure you are all ok).
2 Diet - cut out processed sugars, junk food, processed foods (white pasta, bread, etc), and try to eat a high protein diet with loads of fresh fruit and veg. This will help your body and mood. Consider a good Vitamin B supplement as this is really good for your nerves (as with all supplements, check with your doctor).
3 Exercise - getting your heart rate raised is good for the nerves too - it is very calming and puts all that adrenalin to use. As before, check with your doctor and don't go from couch to marathon in a week!
4 Have a good look at the people in your life and see who is your 'saboteur'. They may not be doing it out of meanness, or even realise they are doing it, but there are some people who, for whatever reason, seem to be attracted to crisis, and even encourage behaviour.
In a very simple example - say you want to give up smoking at work. you go every day at 11am to have a puff outside with your work buddy and have a gossip. You announced that you are giving up smoking - she will be on her lonesome at 11am and will miss out on the gossip. She tells you 'oh go on, its just one, you wont be able to give up, just to keep me company...' Its the same with someone who is going through trauma - some people seem to 'feed' from the drama - being the 'rock' or shoulder to cry on makes them feel better about themselves. They don't mean to 'encourage' you but nevertheless. (Some therapists can seem to be like this too).
People telling you that they would kill themselves in your situation us not very helpful! It is stupid, patronising (oooh, aren't you brave!) and melodramatic. Its almost making your very real trauma into a Victorian drama, and is of no practical use. Tell them to bog off.
Some people are their own saboteur - and that's a useful thing to recognise too.
When you have had traumatic events, you need to process them to get over them, or at the very least, be able to think about past events without the feelings of panic, distress or fear. EMDR is pretty good for helping you to process thoughts/events etc.
I also used to tell people to look themselves in they eye in the mirror in the morning without that look of fear, and to 'walk tall'. You need to believe that you are a fantastic person and you deserve to be happy and strong. Yes, sometimes life is just so bloody unfair and crap, and we make mistakes, but we get through it - you want to get 'on', not just 'by'.
And I see from your post time that you are a night owl. Unless you work shifts, try to get a regular sleeping pattern.