Ra intersticial lung disease

Was hoping to get some feedback on this aspect of ra.Small back story for context,have been taking methotrexate for my ra for about twelve years with limited success but really how do we know.Have stage four enphasema treatment puffers prednisone,etc.
Recent CT scan found a nodule on lung that was increasing in size over years, subsequent pet scan confirmed cancer diagnosis.While undergoing radiation therapy you have to come off injections,upon going back on injections my shortness of breath has increased to now unmanageable.
Waiting for two years to be assigned new pulmonologist have first app end of July so family doctor has been sole care provider.
Has anyone had similar issues like this and if so what was done,my family doctor tells me to stay on it but l have researched methotrexate toxicity and this seems to fit systoms.Any input would sure be appreciated thank you.