Sick of bile!

Elizabeth 🇬🇧
I'm 7+1 weeks and have been suffering with morning sickness and constant nausea for a few weeks now. Because of the nausea, I'm eating very little and so when I am sick there's nothing there except bile. It burns and hurts and I just sit crying and retching into the toilet. 
I'm not sleeping well and wake up throughout the night so try to have some biscuits when I wake up to give me something to be sick on, but it's not helping. 
Just wondered if anyone had any tips? I'm so excited to be pregnant and desperately trying to be positive but I'm really starting to struggle with this now.