Uy, I'd really push you to make time for a checkup soon because 8 months without a period while breastfeeding can be normal, but the ongoing lower belly pain needs a proper look, hindi dapat i-ignore yan, lalo na post-caesarean. One of my mum friends had similar cramps months after her c-section and turned out she had a cyst, kaya better get checked by your OB para ma-rule out kung may issue sa internal healing or something else going on, especially since negative ang PT. I know work is crazy pero health check can usually be squeezed in, maybe ask your company kung pwedeng i-adjust ang schedule even for one afternoon, because this isn't something to just push through.