Loneliness is such a tricky emotion. It's uncomfortable at best, downright painful at worst. You are in an especially tough place as you have just recently let go of a relationship, and so many things are fresh for you right now. God is your anchor and can see you through anything, hold on to this. There is also pressure from society to be in a relationship, etc. Dig deep and draw close to God is my only advice - pray that He will fill your life and bless it through work, volunteering (perhaps?), friends, family, etc etc.