Could a sore throat and mild chest tightening be linked to having eaten bread mold over a week ago?

No. Mould is a type of Penicillin. By the end of a week, it should be through your gastrointestinal system. All the best.
Sore throat. Absolutely. Get checked out or perform a virtual consult.
No. I doubt if you could eat enough bad bread to cause a problem. See your doctor to clarify your symptoms.