Rhinitis Treatment Care

Since I woke up this morning I have had a pain in my chest – right in the middle (and no where else). It feels like muscle/bone pain – as if someone punched me in the chest. But I have no bruise, no chest infection (ie no coughing, but I have been sneezing but thats probably hay fever related) and I didnt do any strenuous exercise yesterday. Anyone have any ideas?!