The weather is starting to get chilly, and as always I am sick . This happens twice a year to me when summer starts or winter starts. It would first start with the sore and itchy throat. then next morning I would have my nose running which last for few days and then coughing for next few days. It all last for a week or so and it would go away. I have never been to Doctor for this,, but I have tried cough syrup and stuffs like that few times which dint really work for me. It lasts for a week no matter what. Do you know what exactly is this...allergies or common cold? what 'bout some no prescription medication??

that's your body's response to change in climate. when winter starts, your body is still adapted to the warm and slightly more humid climate of summer/fall. since it doesn't get what it's expecting, it needs to adapt to the change in climate, which takes time. during that change, numerous change undergo in your body, especially in your blood - change in concentration of salts, certain proteins, and blood cells. and those changes are manifested as minor illnesses like cold, cough, mild fever, etc. syrups and antibiotics might help some people and might not work on some. all you gotta do is stay warm, drink warm water for few days and good food - soups like daal, vegetables, and fruits. 
happens to me too, i just eat good food and increase sleep hours until everything gets back to normal, takes about 2-4 days for me. 
if things start getting intense, taking 1-2 pills containing 500mg paracetamol for 1-2 nights before sleep does the job.