If you are using oil for your dose, you may have this problem.
Often, you can fix this by lowering your dose. I went with 2tbsp- anything more would cause problems, and I didn't really need anything more, especially once I started eating paleo (no grains, no legumes, no dairy except for butter/ghee).
It took me a while to find an oil I could tolerate. I achieved a rather high level of appetite suppression during that time by using a nose-clip and eating baked chicken. This is also an option, but I hesitate to recommend it because I no longer think of this sort of chicken as food. This is probably why it is so powerful as an SLD dose- with no flavor you can tell it is cardboard.
Anyway, you can eat almost anything nose-clipped for your SLD dose, if you find you need to avoid oil.