Acting weird

So first and formost when in doubt see a vet. Budgies hide any signs of sickness or issues they may have like professional spies. You can even call the vet explains whats happening and see what they say.

That aside since I can not see or hear your bird all I can say is this. Budgies always do a little tail wag it can mean a great deal many things from excitment to upset. Budgies also make tons of different chirps, squaks, chatters and all kinds of noise. So Id have to hear it to be sure. But call a vet.

Fruits and Veggies

Budgies do eat fruits and veggies but they eat specific ones. Also if the person or place you got your budgie from did not feed them these items then it will take several attempts. For example my first 2 successful items were Matchstick Carrots and small pieces of Watermelon.