Hey mama, yep totally normal yan sa third trimester, a few of us here actually experienced the same thing around that time, sobrang antok talaga and the nausea can still stick around kahit malapit na mag-deliver. Pero since you're also getting dizzy spells, mas safe pa rin na i-mention mo sa OB mo next checkup para sure lang, could be low iron, blood pressure, or just the weight of baby pressing on stuff na nagpapagulo ng sistema mo, pero better safe than sorry talaga. Rest as much as you can, eat small frequent meals, and drink plenty of water; a lot of my mum friends said that helped manage the dizziness at nausea nang konti. Hang in there, mama, you're almost there na!