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The rubber bone will not always show up on an xray. I would recommend going back to the vet and asking for barium study xrays. This is where they put contrast in the stomach and then watch it pass to see if there is a parital obstruction from the toy.
Also...ask about your dogs electrolytes...there is a disease called Addisons that occurs more in female dogs 3-5 years of age and tends to be overlooked when dogs have lethargy...actually ask about this first BEFORE the xrays.
If these have been rule out, your dog should be on a medication for the nausea and abdomenal discomfort...did you ask your vet about that?Dr.V