Hey Mhairi, I understand what you're going through with the morning sickness, headaches, and insomnia. One thing that's helped me countless times is 'Alka-Seltzer Morning Relief'. It has Asprin, Caffeine, and Vitamin C. I just checked the back of one of the packets and it says "Cure For Morning Headache and Fatigue. Fast headache Relief. Increases Alertness. Gentle on your Stomach". However, like LittleFish said, if your symptoms get to an extreme point, make sure to contact a doctor D=
Good luck =D