No end to nausea?

I have been having quite bad gastric pain and nausea/ vomiting since week 7, was given dicletin and omeprazole since week 9 but it was only for 2 weeks. Now im week 11 nearing 12 and the nausea and gastric pain still bothers me, even have trouble sleeping. Anyone has similar experience, wondering if I should ask for more prescription of the two medication.