For me that feeling of not being able to cry, the building up of pressure and crazy feeling that SOMETHING just HAS to come out is unbearable. it can even hurt! but I've learned a couple tricks. I mean there's a few obvious things that most would suggest, watching something sad, listening to a sad song, (Only Human by christina perry is my fave cry song), but sometimes it's a little more than that. Ripping up newspapers or an old phone book (why not with the sad song playin' eh?), or holding ice cubes in your hands (typically for cutters, that's how I found it) but it seriously works. its a release that your mind and body is looking for sometimes. Hope this helps.