Try alternative medicine NAET. This is a higher level of accupunture. There is a DETOX protocol to clear allergies. You will need to find a chiropractor that is using this method.
Once the DETOX protocol is completed the chiropractor will be able to help you with specific issues.
I have used NAET for over 10 years with EXTREMELY GOOD RESULTS.
Once I completed the DETOX protocol I was able to use for other issues such as cold and flu, rashes, viruses, bacteria lung and cough, blood sugar thyroid, CELIAC disease, arthritis, inflammation, exposure to pesticides and many other conditions.
Good luck
This is actually very very common. Once the lungs and airways are irritated, someone can cough for a couple months or longer after being ill. Your doctor will want to rule out bronchial asthma. A tell tale sign of that is wheezing with the cough. But otherwise, this a common response to a previous air way illness. Hope you are better soon.