Sis, pls see a doctor ASAP or go to emergency kung sobrang hirap huminga mo, chest tightness after delivery can be serious and kailangan ng professional check. Hindi ka lang, maraming moms ang nakaexperience nito, pero grabe talaga kailangan i-evaluate ng doctor. One of my mum friends had something similar and nag-alala kami ng todo, kaya don't wait, call your OB or go to the nearest hospital para ma-check agad. Could be maraming factors, pero iba-iba rin sa bawat mama, so really importante ang proper assessment. Take care of yourself, ate, kayo ang priority ng mga babies natin!