I Am 66 Years Old And Weigh 360 At 6’2”

I am 66 years old and weigh 360 at 6’2” food helps stops my coughing
i have had chronic coughing for over 8 years. I have been diagnosed with Asthma, High Blood pressure, depression, nasal drip, and a tendency to gage slightly (clearing breath) with out cause.

My worst symptoms are feeling as though my lower breathing tube is filling with flam. I have a very difficult time coughing it up,, sometimes to faintness and sore throats.
Medicine interactions may be part of the problem ie Toprel
I have seen many doctors. The coughs start with an allergy, cold, flue, or other irritant. It occurs usually in nov though march. It lasts for 3,4 or 5 weeks. coughs are sometimes very painful usually when i cannot cough flam... that is the biggest issue. dry cough to clear lower cough center of flam or what feels like flam.

I feel like sticking a tube down my through and suctioning it up. This very difficult to live with. i have had the bought of pneumonia and a number of flus and colds and allergy attacks during this time.. 4 of which i had to go to the emergency room with. treatment was inhalers through a mask. Not sure it worked.

i take 12 different medications that otherwise a re working well for me.. see attachedPresent Medications          
Advair Diskus (2x day) 500/50          
Aspirin 81 mg          
Buproprion XL TAB - Wellbutrin 150mg      Depression     
Citalopram TAB - Celexa 60mg      Depression     
Fish Oil 1200 mg     Reduce Heart attack     
Fluticasone - Propionate (2 x day) 1 spray     Easier breathing     
Gabapentin (3 x day) 300MG     Seizures Tension headaches     
Metoprolol Succinate, XL Toprol 50mg     Blood Pressure     
Multiple Vitamin 1     Supplement diet      
Pantoprazole SOD DR (2 x day) 40mg     Heartburn and reflux     
Simvastatin TAB - (every other day) 40mg     Chlesterol     
Tamsulosin - Flomax CAP 0.4mg     Control urination     
Triamterene W/Hcts (1/2) 37.5/25 Tab     Blood Pressure     
Ventolin HFA inhaler (4 x day) 2 puffs     
Asthma rescue inhaler     
Zolpidem - Ambian 10mg     Sleep     

cat scans, X-rays, all tests nothing wrong

I am ging crazy ans need help, advise