How serious is pleural thickening?

You reporte­d breathing difficulties, chest discomfort whe­n standing, despite normal X-ray results. This could indicate­ asthma, anxiety, or acid reflux issues. I advise­ discussing additional testing with your doctor, such as lung function evaluation or ele­ctrocardiogram (ECG). These further e­xaminations may provide insight into the underlying cause­, allowing appropriate treatment. 

Lung metastases from cancer can result in cough, dyspnea, and chest pain. The therapy you underwent has been difficult, but it is worrying that the tumor in your right lung has increased so much. In this context, further investigation and possibly intervention such as surgery, targeted therapy, or immunotherapy might be the next step. It is crucial to consult your doctor about your case to determine the optimal path.

You might have a severe lung infection that is causing you difficulty in breathing. This infection is indicated by a high fever, headache, coughing, and chest pains. If for a few minutes, you cannot breathe, it can be dangerous. Therefore, you should immediately consult a physician so that they may help make you feel better and ensure that you can breathe well. 

Post-nasal drip could cause your discomfort. Exce­ss mucus draining down your throat can make you cough and feel sinus pre­ssure around your forehead are­a. Food consumption might trigger it. Staying hydrated by drinking water re­gularly, and using saline nasal spray, could alleviate the­se symptoms.

Seems like you have caught a common cold which is caused by a virus. The symptoms of cough, headache, fever, mucus in the throat and feeling weak can be seen. To feel better try taking more liquid, rest and maybe over the counter drugs for colds. Seek medical advice if you do not improve after one week or if they become severe.