Hi.. Thanks for the query.. As per your complain it looks like your tooth is either decayed or there is fracture in your tooth that causes throbbing on putting pressure.. Although you might have small fillings over the tooth but there is a possibility that the tooth is decaying under the filling, known as Secondary caries.. I would therefore suggest you to consult an Oral Physician and get evaluated and a thorough clinical evaluation and investigations like x ray can help in diagnosis and treatment can be done accordingly.. In case of deep decay root canal treatment can help in relieving the pain and removing infection followed by a course of antibiotics and painkillers.. In case of fracture of tooth the treatment will depend on the type of fracture and that can be ruled out with x ray only.. Fr further discussion and if you like to know the appropriate way to proceed for treatment you can send me x rays of your tooth by going to my profile and clicking on Ask me a Question I will explain in detail about how you should proceed for treatment after looking at the x rays and asking appropriate details.. Hope this helps.. Regards.