I understand…if they are having NFS problems, there may be a large queue of support request, and they may not have come across yours yet. If you have already submitted three tickets, I can’t see how submitting another would help.
It may also be true that, if there is and NFS issue, they are more focused on getting it fixed then they are on responding to tickets…
Did you check the .snapshot directories for your files?
Finally, if a three hour downtime is making you “lose money”, you might should consider whether or not a low-cost shared server host without an SLA is appropriate for your site. DreamHost is a great value, but “it is what it is” and, if your livelihood depends on 100% uptime, it may not be your best choice as you do not have telephone support available in situations like this, and responses from tech support may take some time.