Chronic Cough - Very worried please help with some advise

Hello all, this is my first post here and I am very worried. If you can give me some advice I would greatly appreciate it. My wife, aged 32 active female nonsmoker had a cold with a very slight fever about 7 weeks ago. She got better in a few days but lost her voice for a day or two from which she recovered well. However, after that, she began coughing and has been for 6 weeks now. At the beginning, I got her  an OTC anti-inflammatory spray and some lozenges. The spray didn't help and mad her gag a few times. We went to the first GP and he said her lungs were fine and gave her an expectorant. She was coughing all throughout the day, sometimes in fits. The expectorant didn't work and we went to the ER. They gave us a cough syrup, some ibuprofen, and an antihistamine. We barely saw any improvement and the cough came back when we stopped the syrup.  We went again to the ER to follow up and they gave us Codeine syrup, again an antihistamine and some antacids. We didn't see any improvement and were frustrated so we ordered a chest x-ray which was clear. We went to a lung specialist and he said it could be asthma (even though she has never had any breathing problems and is very energetic). He gave her an inhaler with steroids which she has been using for 24 hours and we haven't seen any improvement. She has not been sleeping at all for 3 days and took some codeine phosphate syrup last night just so she can sleep for a few hours. This morning, the cough is back.

She has no symptoms associated with what I've read online. No fever, weight loss, night sweats, weakness, fatigue, chest pain, shoulder pain, difficulty breathing, clubbing, coughing up blood. Nothing.

She also says she feels two kinds of coughs. One that comes from her lungs which she feels better when she coughs something out (even though there is nothing that comes out), and another one that comes from a very itchy throat. She says she feels her throat is scratched. Sometimes, steam showers help her, other times not so much. I have been reading so much online and I am very worried, distressed and unable to cope/function. We both haven't slept much are unable to work. I have taken a leave from my job. A part of me feels that it is a cough and it will pass and the other part wants to make sure I do everything in my power and whatever it takes to see my wife not suffering this much. Last night she coughed till the point of gagging and almost vomiting. I read about tumors, and pulmonary fibrosis and got so worried - but after 6 stethoscopes and an x-ray, wouldn't one of those doctors notice something abnormal in her lungs? She has no genetic history of any of these diseases.

It is worth mentioning that her aunt (not blood-related) developed a respiratory disease after starting a new job as a municipality Gardner. They initially thought it was asthma. And within 2 months she had lost around 15kg - ending up with 2 lung biopsies and eventually dying (all within 3 months). Nobody ever told me what she had, the family was too distressed to know. She was basically a healthy 55-year-old casual smoker who was fit and active. She weighed around 50KG.

So we are very paranoid about why my wife is coughing that much and I would appreciate any help/advice/insight because I feel miserable.

Thank you.

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