I just want to comment on downregulation of neurotransmitter receptors in general.
We really don't know how permanent and severe the downregulation of various receptors due to drugs (SSRIs, benzos, amphetamines/stimulants, etc) is. It's very variable, difficult to test and measure (most research is done on other species, not humans), and the effects of downregulation are not well understood. Downregulation has been hypothesized to be GOOD (therapeutically valuable) as well as BAD (a sign of damage, tolerance). It could be different for different systems, or it could even be both good and bad at the same time.
So yeah, keep all that in mind...
As for your personal situation, kharma, I suggest seeking treatment with a medication that won't change your brain chemistry as much. If anxiety is your problem, perhaps look into Buspar, Serzone and Remeron which have not be shown to cause any sort of downregulation. These drugs are also non-addictive and much less likely to result in tolerance, and can be very effective for anxiety and even depression.
Best of luck to you...