Blockage on left side of skull. Months.

Five years back I suffered from cold. It lasted for a month. I generally avoid medicine. Since then I feel blockage on left side of my face. I also have sinusitis. Moreover, the cavity of left nostril showed some blockage based on an X-ray. I get severe headache on same side of my skull when it gets cold, or the weather is dry sunny, or dusty. All this happens on left side. I also feel that this has some link with my wisdom tooth, which is tilted in a way it presses other teeth. That also gives pain at times. As brought out above, I always have sense of blockage from left nostril to left ear. I get a feeling, it has something to do with my mid ear, because lately I feel giddy when I turn my head. This sense of giddiness goes away but comes back occasionally. Please note that my activity level is very low for last 6 months.