I constantly have the feeling of not being able to take a deep enough breath unless i force my self to yawn which is also difficult what can this be?

Difficult to tell: From your description these are subjective findings and to answer your question would need more specific info. If you find that your breathing is affected by this suggest you see a pulmonologist and be tested appropriately. Best to do this earlier rather than later, since if there really is a problem it will be easier to rectify. Good luck and feel better.