Maja:
Just my opinion, but it sounds like the oil may be loaded with chlorophyll. Possibly made with a lot of leaf material. That is not good. What makes me say that is you mentioned burping. I have heard similar issues from other patients.

Sounds like low grade oil. That is one big reason why I always recommend making your own oil whether you grow your own or purchase the buds. It is easy to make.

Unfortunately it is difficult to trust others to provide good oil and that makes us good folks look bad. It also makes RSO look bad.