Hi folks. For anyone following this I think I can now end it.
I went to my gp today who then sent me to a&e and after a 6hour wait I finally got seen. I do actually happen to have a sore muscle on the left side of my chest at the side, just over a rib. A physio sessions should cure this.
I got blood tests, EPG and all other normall test which all came back good. I cant remember the correct name but the doctor explain that around the top of your lungs you have a gel/muckas which sometimes this gets slightly blocked in your airwaves which can cause a build up and cause pressure which cause the sharp stabbing pain. The reason this pain only lasts a few seconds is because your body is able to break it up and move it on. This also explains the feeling of being short of breath. The doctor maybe then thought I might be in the early stages of a collapsed lung but the xray confirmed everything is ok.
One other thing is then sometimes when I eat I get a feeling of the food sticking which is also caused by the above.
In general I have no serious health issues and my heart, blood pressure etc is all good.
Thanks to everyone who gave their views in this thread