Although advice is given over the Internet, you can never be truly certain of the source and subsequently their qualifications. Therefore contacting a doctor means you are sure to get the correct information and if there are any problems then they can immediately be addressed.
Reading about symptoms and possible illness or ailments over the Internet can be detrimental as it can cause undue stress which can simply be avoided by a trip to your physician. As more times than not, the illnesses you find and believe you may have are not actually what is wrong.
If, for some reason, you can not make it to the doctors in person then it is still worth contacting them via the phone. If you don't have their number it should be fairly easy to find on the Internet. Simply head to google.com and type in the name of your doctor's surgery and the town or city it is located in. The doctors should have a website, and if you head to their contact page you should find their phone number.