Bf is sick and now has a stomachache

Hi guys! My bf has been sick for 3 days. He first developed a fever, and then kept having stomachache every time he swallowed anything. He also had stuffy nose and then now he's coughing a lot. 2 days ago, he visited a local general clinic. At that time, he didn't have an issue with his stomach yet, so they gave him a lot of medicine to take for phlegm and fever. Last night though, he couldn't eat because it hurt him every time he swallowed. I thought it was acid reflux, so I gave him medicine for that. After a few minutes, he started vomiting a lot. This morning, he still couldn't eat much because it's still hurting his stomach. Should we go back to the general clinic? Or should we go to a specialist?

I could speak broken Japanese for daily conversation stuff, but I can't understand technical words. What should we do?

Any information or advice is appreciated!