Thanks for your question on Healthcare Magic.
I can understand your concern.
Since your
chest pain is subsided by pressure, possibility of
musculoskeletal pain is more.
Awkward Sitting position in flights can cause muscle spasm and throbbiing chest pain.
So musculoskeletal pain is more likely.
But better to rule out heart diseases first because your pain is situated on left side.
So get done ecg and 2d echo. If both are normal then no need to worry for heart diseases.
For musculoskeletal pain, you should avoid awkward sitting postures.
Sit with proper back and chest support in flight.
Application of warm water pad on affected areas is also beneficial.
You can take simple painkiller like
ibuprofen for pain.
Don't worry, you will be alright with all these.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.