I was spray painting a prop for about 5 minutes and probably inhaled some fumes. Since then, I've been feeling tightness in my chest and a dull pain on my right side for a few days. Ive read that this could just be lung inflammation and should go away on its own, but Im still worried. Should I be concerned about this?

It's natural to feel concerned. Short-term lung irritation from spray paint fumes often subsides with time, especially if you're now in fresh air and staying hydrated. However, if the tightness or pain worsens, or you notice symptoms like wheezing or breathlessness, consult a doctor promptly.