Citizenship?

I was born on the 26th of January year 1980 in Naples Italy with both Filipino parents. After a year my mother brought me to the Philippines and I was adopted by my immediate relative and was naturalized as a Filipino only to find out after 25 years the truth about my citizenship. I had in my possession all the necessary documents pertaining to my Italian citizenship. I had my birth as well as my baptismal certificate and a certification from national illnesses insurance institute. I want to know if it is possible for me to acquire back my Italian citizenship or to have a dual citizenship. Can you please send me the information on how I should process my application and all the requirements that I need to submit and the time frame of the said process. Your consideration will be greatly appreciated.