I suggest you use other anti-inflammatory drugs, such as azithromycin/Shuanghuanglian/erythromycin/ofloxacin. It seems that your system is allergic to penicillin drugs;
If you can only use these drugs, I suggest you go to a regular big hospital for drug sensitivity test, and there may be some batch numbers of drugs for you;
And the medicine drops slowly. Try to take an injection after a meal, which has little irritation to the gastrointestinal tract and relieves the symptoms you said.
In short, it's okay. Don't worry too much. There should be no big problem if you do as I say.