Otc antacids and pain killers are always a good choice. Trying to get some of preffered antiemetics can help as well, some countries have otc versions that are good enough if you cant access meto. Like in my place lucky to have otc domperidone. Try searching on big sn guides, they have list of meds thst csn be used, see if some are otc in your country,maybe under different names
I hope it helps a bit, good luck