i was incredibly sick it seemed at all times during the day to the extent that i had to take unpaid leave off work. taking a shower or brushing my teeth would make me gag, the hot water would make me dizzy. i was getting up at 1am, 3am vomiting etc. like bbc_mom i found some smells completely untolerable - particularly shower gel, cleaning fluids, perfumes etc. everyone said it would go away by month 3 but it didn't. i didn't feel better until month 5. what contributed to it all was because i was still trying to live my life as normal - so was still rushing around, walking to and fro work etc. this made me really tired without realising it and i would often feel worse after a hectic day. even though you don't feel like you need to, try and slow down your pace in life because even if you can't see it, your body is working incredibly hard to make the baby.
i had headaches aswell because my blood pressure was low at one point. because i was so sick i couldn't keep much down, my fluid intake dropped which made the headaches worst.
i didn't believe it then, but it definetely does get better