What Causes Vomiting, Motions, Stomach Pain And Headaches?

my mother is 50 years old,she has a herniated disc(L1,s1),she was asked by the doctor to undergo weight reduction,she was suggested by her hypnotherapist to go for herbal life products ,she continued it for 4 moths but only lost 4 kgs. she stopped it for a week now,now she is not feeling well,she is womiting,motions ,having stomache pain.and most times she is having vomiting sensation ,soetimes hyeadache..she is also having gastric problems from past 4 years.plz do advice me whatt should i do now. should i consult the coreligionist(under whose supervision she is taking medications) or the gastroentrologist or the nutritionist ...in such case u plz suggest me a good nuetriniost.