I'm 30 Years Old I Usually Smoke 4 Or 5

I'm 30 years old i usually smoke 4 or 5 ciggarer per day i usually drink coffee & coca cola bcz i work in a big leather factory and it helps me get alert... .. My problems is that i usually have headaches almost 4 or 5 times per week and my headaches are worst when i try to stop smoking or coffee.... .. I went to a hospital i get a complete check up and they told be I'm fine and it's just the withdrawl syptoms but I'm afraid bcz it has been 2 yeasrs since this headache started??