My DS11 has had a heavy cold with cough for the last two weeks. It comes and goes a bit, but has been persistent. He has weak lungs and colds always go to his chest and linger. For the last couple of days he's had a terrible headache too. Generally looks tired out by lunchtime with dark circles under his eyes. He has had loads of negative LFT and one negative PCR. He has had so much Calpol and is on Vit C, Vit D, Zinc and Vick chest rubs. What would you do? Should I call the doctor tomorrow?