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Hello I am Dr. Joey. Thanks for asking your question and trusting me to help you and your pet today. I am a licensed veterinarian with over 18 years of experience.
Did your veterinarian do any testing to try to determine why it didn't clear the first time such as lab work (CBC, chemistry panel, urine check)? There are so many things that could cause dry heaving and now lethargy. However, it sounds like your vet was trying to treat for possible infection (bacterial). Perhaps this is not an infection, though.
Sorry for the delay in a reply. If this persists through the weekend, then further testing is indicated. I am not sure I would jump to "allergies" with vomiting or dry heaving. I would be more concerned about ingestion of something that upset the system or is trapped in the digestive tract, or an organ issue (liver, kidney, pancreas). Therefore, the next step is some lab testing (CBC, chemistry panel and thyroid check) and then some radiographs (X-rays) if that is normal. She also would benefit by being on something to help with nausea. Over-the-counter you can easily try Pepcid AC (famotidine) 10mg at one-half tab once daily. No bad side effects and works great in some cats. You an start that with the medications she received.