Since your flying back home, I would say be aware EK may screen you more. They don’t have masks but ultimately your dammed if you do and dammed if you don’t ie mask + cough = people think you have it anyway. I would suggest if its intermittent, just let crew know on boarding your fine but have a poor chest, will help with fears of others and just remember to have a pack of tissues and cough into the tissue and throw in the sick bag and stick bag in the bin on exiting