It's best to have your budgie seen by an Avian Vet who can properly diagnose and prescribe the correct treatment.
Avian Vets have special training to determine the cause of symptoms resulting from illness or trauma. This is important as "regular" vets will often overlook symptoms that are quickly obvious to an Avian Vet.
When you rely on anyone who has not had training in Avian diagnosis and care, you may be delaying effective treatment. This can prolong suffering that may be avoidable.
The bird will often require a more intense, prolonged treatment with a poorer chance of full recovery than it would have if you seek prompt professional diagnosis and treatment at the first sign of illness.