Being lovesick is like being punched in the gut instead of the face. Being lovesick is like your crush shot you in the chest. Being lovesick is forcing yourself to eat when you don't feel hungry. Being lovesick is feeling nauseous at a familiar scent. Being lovesick is feeling your broken heart consume you with depression.
I was lovesick last month because my crush didn't feel the same way but she still wanted to be friends with me.