The better part of the suppository is that you don't lose the medication if emesis occurs before its all absorbed from the upper G.I. tract... especially if you took a pill.
Being a Flight Attendent will make some of your recovery tricky - all the bumpy take-offs and landings, the altitude changes, the alterations on your brain, aggrevations on you vasculature.
Even with pressurized cabins you are not receiving appropriate pressures for normal brains let alone injured brains for 2 hr flights or longer, so it will present with constant aggrevations to you.......if at all possible you are faced with some added needs for some type of rest that we, other brain injured are not - rest from those altitude aggrevations.
You might explore with your employee health folks if any accommodations in scheduling might be possible for a while, while you get a handle on the headaches - I know its a hardship, I don't know how your job is arranged with Health Benefits etc. but might be worth exploring....in this early stage.
A very good source for information on Brain injury is
Brainline.org , if you wish to wish to garner information.
Mark offers good information about Ginger, a good natural way to approach stomach issues.
A Stickie is a thread that is always 'stuck' >posted at the top of the forum, ready for access with information.