Congratulations 
B6 is supposed to help nausea, but not vomiting. I took B6 3 times a day, 25mg a time. You can overdose on B6, so don't go over this amount. Takes a few days to get into your system, so don't give up.
I would say it helped. But I also did many other things like eating porridge before bed, eating a banana first thing before I got up (also both high in B its). I suffered very badly with nausea until 20 weeks, day and night, and it got worse as the weeks went on. Just kept going up a notch.
I would give it a try, and I'm sure it helped me. I think I would have been even worse without it. I also had the sickness bands on, slept a lot, kept eating (forcing myself to eat) so my stomach was always full. If my stomach went empty just for a moment, my god I felt so bad.
It's a horrible time, and you need lots of support. You need those around you to understand that pregnancy sickness is evil and debilitating; suggest to anyone who wants to know it's like having the flu all the bloody time!
Good luck with these weeks, they will go, as hard as it seems right now. I kept focussing on the next milestone. Getting to 8 weeks. Getting to 10 weeks (quarter through!), getting to 12 week scan etc etc.
Hope all goes well x