I've had a cold in the past few days. My nose is clear but it's gone to my chest and I am coughing but struggling to cough up the phlegm, and I feel achey and generally unwell. I also am feeling quite nauseous. Not anxiety nausea. I genuinely feel quite s*. Is this normal from forceful coughing and swallowing phlegm? I am freaking out as when I'm coughing quite a bit I feel like I could v*.