I hope your do not have any problems on holiday, but I suggest you get a good holiday insurance policy to cover any health/medical problems. If you are staying in a self catering studio at BWI you will be able to prepare most things yourselves and shop for fresh produce locally. I am sure BWI will do their best to help (they may not even know if certain items they use contain this flavour enhancer), so I think at the end of the day the responsibility for what you eat is yours, only you can decide if you want to eat something or not.
Alternatively Kariwak Village is a holistic resort with a menu made from natural ingredients, most grown in their own gardens. Unfortunately it is a long way from Speyside being located in Crown Point. Worth a visit maybe, check out this link
http://www.mytobago.info/accommodation.php.
Have a look at the restaurant and cuisine section on this website.
http://mytobago.info/cuisine.php
What about the food on the airline? Have you pre-arranged something?
Hope you have a pleasant time with no need to visit the doctors.