hello and welcome to HCM forum,
i would like to inform you that due to improper fillings on upper teeth, the contact between upper and lower teeth has increased now.
The only solution is to get the fillings replaced with new ones, kindly see a specialist this time,
once the fillings are redone properly,
pain on chewing will resolve completely,
Also, the lower chipped tooth can be restored with a tooth colored filling.
Until you see a dentist
i advise you to take a pain killer and avoid chewing on hard stuff for a while.
apply warm compresses on the jaw joint (twice/day),
i hope i answered your query,
i wish you good health.