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Hi, Welcome to Just Answer. I'm Chris, a small animal Vet based in the UK. I will review your question and get back to you ASAP with a response
Can I ask if the vomiting is digested or undigested food? And what colour was the diarrhoea?
Ok it sounds like vomiting rather than regurgitation. Vomiting/diarrhoea in budgies can occur for a number of reasons, it can be due to bacterial, viral, fungal or parasitic infections, impaction in his crop or dietary changes. If he doesn't normally have dill in his diet then this might have upset him, in which case signs should improve quickly over the next 24hours, however his lethargy does concern me and I would consider if possible taking him to a vet (ideally one that specialises in birds) for a check over.
I hope that is helpful, please let me know if there is anything else I can do.
The most important thing is to try and keep him hydrated, if he will tolerate it then giving a little water or diaoralyte into his mouth every few hours may help, however if he is vomiting this could be difficult as it may not stay down. Severe fluid loss can be life threatening to such a small bird. I hope he starts to show signs of improvement soon.