It does get a bit annoying the hiccups, my DD had them (no joke) around 12 times a day 24 hours a day, I actually got worried as it was so much that I asked the MW about them and she just said that hiccupy babies come out as hiccupy babies and its so true as she still gets hiccups really easily. Not sure on the vibrations, will see if I feel them.
Kezzie - all the things you said are natural stuff, its the crazy things like the castor oil and forcing to be induced for no reason that I think is awful. I also took raspberry leaf capsules from 37 weeks and did lots of ball bouncing. The ball bouncing is great for getting the right position.