locked up on me. Since then I have felt off and on heaviness in my chest, like a smothering suffocating feeling, and sometimes it lasts nearly all day, and so often I just can't get that deep satisfying breath so I try to force it by frequent yawning, and sometimes I can't even complete the yawn! It has made my life a living hell recently, and doctors can't seem to find anything else wrong with me other than to say it's anxiety. They gave me Efexor which after 6 weeks has done no good and I think may be making it worse so I am trying to wean off that. In the meantime the only thing that seem to bring me any relief is Valium! Has anyone else had this, and if so, have you tried anything that works?! This is beyond awful!