This patient support community is for discussions relating to undiagnosed symptoms, breathing difficulties, feeling cold, cough, diarrhea, dizziness, fainting, fever, indigestion, itching, nausea, numbness, pain (chronic), paralysis, rash, sweating, swelling, urination problems, and vomiting.
There are lots, lots, lots of reasons for dry cough. The main ones that I would suggest to you are Post Nasal Drip, which is just drainage down the back of your throat, due to sinus issues. The drip makes your throat "tickle" and then you cough.
Also, you should consider Reflux. Most people who have symptoms of reflux don't even know they have them. When the acid splashes up into your esophagus, it causes irritation to your throat/windpipe. This irritation can cause coughing, which could be why it's worse when you lie down.
Your doc should do more than just put you on an antibiotic. Maybe you should visit an ENT (Ear, nose throat specialist). They can put a little camera/tube down your nose (totally painless) and actually see what's going on down there.
An ENT is definitely the way to go if I were you.
Good luck.
You said, "I did go to the Dr. and he but me on some anti-biotic...."
Did you return to the doctor when the antibiotic did nothing for the cough?
He needs to know this, so that he can decide what to do next.
Tell the doc about your concerns about heart disease and lung cancer.
Also, he can evaluate you for post nasal drip and for acid reflux.
(BTW, congrats on quitting smoking!)
If you haven't gone back to the doctor about this, he has no idea that what he prescribed didn't work.
You can get some baseline measurements to show him.
Take your temperature when you wake, and then sometime in the afternoon or evening.
Make a note of how much sleep you're getting for a couple days.
Are you feeling tired on 5-6 hours a night, or is it 8-9 hours?
Getting enough sleep is important for your immune system.
Cut out sodas and other sugars.
Eat fresh fruits and vegetables.
I don't know if you have an infection or not, but give your doc a chance to figure out what's wrong.
Hope you're feeling better soon.
Carol