I've had a cold for a few days, which progressively gets worse (started with a sore throat Thursday, followed by muscle soreness/fatigue, then a hacking cough yesterday, etc). I woke up this morning (about 7 hours ago) and had a little difficulty breathing. It's still more of a strain than usual to breathe, and it's often accompanied by pain, as if I'm breathing in smoke. Is this just a bad cold, or should I try to visit an urgent care center today?