What are you going through is a normal reaction when going through a breakup. You just need perspective and that will only come with time. In the meantime focus on your physical health - diet, working out, sleep etc. Don't repeat my mistake - these things may seem completely pointless now and future may seem bleak etc. But please, just do it, you will thank yourself in the future. Watch some movies, I recommend "Swingers" (1996) and "A Serious Man". And remember, there are plenty of fish in the sea.