Anak, hindi ko dapat mag-diagnose, pero ang back of head pain + breathing difficulty ay dapat i-check ng doctor mo agad, lalo na habang pregnant ka, please don't wait on this one. Call your OB or go to the nearest clinic kasi pregnancy changes a lot ng things sa body mo and sometimes symptoms like that need proper checking. A few of us moms have had different issues during pregnancy na akala namin okay lang, pero the safest thing is always to let the doctor assess you in person, especially when breathing's affected, mas importante yon. Tell your doctor exactly what you're feeling so they can rule out anything serious. Ingat, ha?