hi.. thanks for using HCM..
you have chest tightness
while working and walking upstairs..
this needs to be evaluated to angina
with ECG and treadmill stress test
once it is ruled out then we can think of muscular problems due to bad posture, repititive strain injury
for this see a physiotherapist, along with analgesics tablets and gels for application..
do regular exercises and multivitamins with micronutritient supplements...
all the very best.