Post-break-up remedies

When somebody you love breaks up with you it always hurts. But what do you do, when you cannot be angry at that person(or anyone else for that matter), you lose the ability to cry after few days, you simply do not know, how to deal with all the emotions that are deep inside of you? Staying in and eating ice cream(in my case substituted with vinegar crisps) did not work and going out, drinking heavily and partying did not help either. SO what now? Being this deeply sad is exhausting me and I certainly cannot carry on with this insomniac lifestyle..