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I would not recommend doing anything that your doc does not approve of, so if your doc is telling you 2000 per day, I would stick with that. That being said..here is the information:

http://www.vitamindcouncil.org/newsletter/h1n1-flu-and-vitamin-d.shtml

(snip)

“1.Take enough Vitamin D3 to get your 25(OH)D level above substrate starvation levels (50 ng/mL or 125 nmol/L). Levels of 50 ng/mL usually require at least 5,000 IU per day for adults, some adults will require more. Children should take 1,000 IU per every 25 pounds of body weight. After taking this dose for 3 months test your 25(OH)D level. Individual variation in dose response is great and natural 25(OH)D levels (50–70 ng/mL) are not assured by these doses. For reasons I will discuss below, I think it possible that Vitamin D levels of 30 ng/mL, which are often obtained by people taking low doses of Vitamin D (1,000–2,000 IU/day), may increase your risk of death from a 1918-like influenza virus.”
(end snip)

I recommend going to the site and reading through the information. I am only going to do it for a few months and then have my levels tested. Hope this helps.