Shortness of breathe query. Required?

Hello doc, I had taken multivitamin tablet ( Health ok) around 4 to 4 15 PM. After that I forgot that I had taken tablet and within 15 to 20 min I taken soft drink ( Thumps up) and some salted potato chips. When I walking I felt mild shortness of breathe, uneasy feeling, upper back pain, burping and something in throat. I didn't felt any chest pain. I use to do regularly aerobic exercises and I didn't felt chest pain during exertion except heartbeat. Whats the problem doctor ?? Is this due to caffeine soft drink mixed up with multivitamin or is anything related to heart??? Is ecg required ? For you concern I had done tmt echo 2 years back due to pain in costochondritis area everything normal and in between echos and ecgs are normal. Please help and suggest. Thank you.