I think that getting your GP's input about whether or not another vitamin D test should be done would probably be a good idea. Even though I think that taking 2,000 IU of vitamin D would likely minimize any decline in your vitamin D level that could be occurring as a result of seasonal changes, it seems possible from my perspective that your vitamin D level could still be declining as we approach the end of summer and that such a decline might possibly be a reason as to why you've been feeling as exhausted as you've been feeling. So, I think that getting your GP's perspective on this matter and talking to your GP about whether it might make sense to get your vitamin D level retested would be worthwhile.

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