Hello! i understand your query and I acknowledge that your husband needs prompt treatment. There are 2 things to consider regarding your history, first is a respiratory(lung) problem and a cardiac(heart) problem. Every part of our body needs adequate oxygen perfusion to function well, fatigue and sleepiness may be a sign of an inadequate oxygen delivery to the whole part of the body including the brain. Respiratory problems such as Chronic Obstructive Lung disease (COPD), asthma, Community Acquired Pneumonia is a common problem. Is your husband a chronic smoker? if then COPD may be entertained, COPD usually shows up in the elderly due to chronic smoking. COPD is a long-term, progressive disease of the lungs that primarily causes shortness of breath due to over-inflation of the alveoli (air sacs in the lung). In people with emphysema, the lung tissue involved in exchange of gases (oxygen and carbon dioxide) is impaired or destroyed. Cigarette Toxins also repeatedly damages the cilia (hair like structures) of the respiratory system which is responsible for sweeping off bacteria and debris outside of the system this leads to impaired mucous clearance thereby blocking entry and exit of oxygen in the air passages, COPD also increases the likelihood of Community Acquired Pneumonia(CAP) due to the stasis of debris. Did you notice him coughing from time to time? Check his temperature, is he having fever? CAP is also common among the elderly patients even in those who do not have an underlying disease such as COPD since the respiratory tract is no longer functioning well due to aging. Community Acquired Pneumonia is caused by a bacteria, a chest x-ray APL view may also be indicated to confirm diagnosis. If pneumonia is confirmed, antibiotics may be indicted, he may take Cefuroxime 500mg 2x a day for 7days. He may also take a bronchodilator and a mucolytic such as a salbutamol + guaifenesin 1 cap 3x a day for 5 days for easily expectorate sputum. But take note that he needs follow up after antibiotic treatment. In asthma, patients tend to have hyperactive airways, there is also a bronchial constriction which impairs oxygen delivery. Does he have increase respiratory rate? asthma is also clinically diagnosed by using a stethoscope and further history is also needed. Another thing to rule out is a cardiac(heart) problem, him having generalized fatigue and shortness of breath (having out of breath) may also be a sign of a congestive heart failure. Patient should be clinically evaluated immediately. Laboratory test such as 12 Lead ECG, 2decho, stress test. chest x-ray may be done. Furthermore, I recommend that he seek personal consult from an internal medicine Physician since this conditions I discussed previously should also be evaluated clinically and patient may be subjected for admission if he continues to decline food intake. The use of a stethoscope is also necessary to check for presence of crackles or wheezes in the patient s lungs, listen to heart rate and rhythm, rule out heart murmurs. Chest x-ray is also needed to look for presence of pneumonia, signs of congestion, increase in heart size and others. Hope this helps a lot, thank you and God Bless!