Sorry to everyone suffering, hats off to you functioning I find it hard enough toddler wrangling with nausea and exhaustion! I can't quite remember how I got through these weeks working last time, I can't have been very productive! Though I remember feeling more human by about 16 weeks, so only 8.5 to go 
I've gone off coffee but still having a couple of cups of breakfast tea, which is well within the 200mg NHS caffeine recommendation. Crackers are definitely a godsend I'm keeping a small packet in my bag at all times, had to run off from soft play yesterday to eat some so I didn't vom in the ball pool