Ive been feeling like theres air in my ears and nose sometimes. i usually feel that it when i yawnis that normal? also ive been getting headaches and the feeling of cold liquid in my head. i just wanna know if its something serious?

Your symptoms suggest a bit of nasal and sinus congestion ;when you yawn or open up your mouth wide you open up eustachian tube and clear it. Possibly you have a bit of sinusitis. Try taking some sudafed and flonase. It does not sound serious, but if you are concerned, visit your doctor.

It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!