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Hi there. Thanks for the question. Let me see if I can help.
Obsessive tail chasing in a dog can be an obsessive-complusive disorder (like OCD in people) or can be a sign of a neurological issue...so I would not recommend continuing to ignore it
If your current vet won't help you, you may want to reach out a specialist (veterinary neurologist or veterinary behaviorist) and get more advances help.
Some dogs require anti-anxiety medications...and some just need some changes to their diet or some behaviorly modification
Here is a brief article about a study looking at obsessive tail chasing in dogs: http://phys.org/news/2012-08-canine-tail-resembles-human-obsessive.html
I hope this has been helpful. Let me know if you have any other questions.