Seeing a neurologist for a complete evaluation should be in your very near future. Chest
pain as you described does not normally go with MS, nor does pneumonia. Chest
pain from the infamous MS hug is a different type of discomfort from what you write here.
Contrary to common thinking, even though MS is thought to be an autoimmune disease, our systems are overactive when it comes to germs and viruses. MS patients can be a pretty healthy bunch - as ironic as that may sound.