First of all, true HGE cannot be treated at home. It is a serious emergency and requires hospitalization.
Yes, I would see a specialist and sooner rather than later.
I don't know if you saw my thread about Teddy Bear this year ... but here is it in case:
http://www.yorkietalk.com/forums/sic...ver-shunt.html
I am not suggesting that Fletcher has a shunt...just bringing out the fact that he was around the same age and look at what happened!
Specialists may cost more initially; but in my experience, they get to the problem quicker than many vets and it ends up cheaper in the long run imho.
If you want to find a specialist in your area, here is a link to search:
American College of Veterinary Internal Medicine > Home