Indoor exposure to black mold can cause upper respiratory tract symptoms such as sore throat and cough along with wheeze in otherwise healthy people. It can precipitate asthma attacks in people with asthma. Black mold can cause hypersensitivity pneumonitis in individuals susceptible to immune-mediated condition. So, if you have chest pain this needs to be investigated. An X-ray and simple blood test to detect mold toxins is usually confirmatory. Other than this chest pains on left side can be due to a heart cause, or due to costochondritis or due to a bad gastric reflux. If you had staph or MRSNA infection, then usually there would be fever, malaise, chills etc.
Do get the chest pains investigated for the causes mentioned. Since, heart causes can be really dangerous, do seek an early appointment. Take care!