Digestion problem (7 wk pregnant)

Hii doctor I am 7 wk pregnant I am facing lot of discomfort digestion problem I couldn't eat anything once in a day I am getting vomit but other time I couldn't eat anything my stomach doesn't support even light food severe heartburn .. I use to take some soda I don't no is it safe or not .. but something I can adjust.. due to this whole day I am not hungry but in midnight feeling hungry that time I use to have Maggie ... it's not affecting me .. but I am worried whether it's safe or not .. docter gave me a tablet cor-3... feeling very difficult to eat if it is a liquid I am vomiting everything.. if it is a solid very difficult to digest.. plsss suggest me something doctor and not getting proper sleep in night even in the morning ... I am facing more difficult every day and night is a problem for me ..pls just me something doctor I can't manage.. kindly help me on this