I have my doubts, based on the following:
From http://www.vitamindwiki.com/Handout+on+Vitamin+D+%28Hormone+D%29+and+sleep+-+Gominak+2012
"If you have a neurologic problem that is severe enough to see a neurologist, you probably do not heal your body in sleep as perfectly as you once did. Most of us who have **** headaches ****, tremor, balance difficulties, vertigo, burning in the feet, depression,**** body pain ****, or memory loss have abnormal sleep and, surprisingly, fixing the sleep can fix the neurologic problem. From 2005-2009 I performed sleep studies on most of my patients and used medications or sleep masks to try to help their sleep. In 2009 I accidentally discovered that most of my patients had abnormal sleep because they were vitamin D deficient.
Low D affects all the blood cells: There are D hormone receptors on the red and white blood cells. When the white blood cells don’t have enough D they get confused, they start attacking our body by mistake. So all of the autoimmune diseases: multiple sclerosis, lupus, rheumatoid arthritis, psoriasis, and ulcerative colitis, are related to low D hormone. Our own white blood cells travel through our bodies at night seeking out and killing cancer cells".
It may well be that a deficiency in vitamin D is causing your white blood cells to attack those in your body, particularly the nose, because that is where many bacteria, viruses, and fungi enter the body as we breathe.
Obviously the only way to be sure is to have your blood tested, but note that what doctors regard as a vitamin D insufficiency is completely different to that of the vitamin D experts, so they are likely to dismiss levels of 30, or 40 ng/ml as being in their "normal range". I strongly suggest that you test your levels soon, and in the meantime, read and take notes on the articles at vitaminDwiki.com and view Dr. Mercola's lecture, etc.
View my comprehensive previous answer about vitamin D at https://answersrip.com/question/index?qid=20140606070917AAfoGCl If supplementing, (the non preferred method, according to www.vitaminDcouncil.org ) use only vitamin D3. Also view http://www.vitamindcouncil.org/about-vitamin-d/how-do-i-get-the-vitamin-d-my-body-needs/ & www.sawyer.com/understanding-uva-uvb/ & http://articles.mercola.com/sites/articles/archive/2014/10/19/cholesterol-sulfate.aspx Consider the UV meter shown in vitaminDcouncil.org at Sunfriend.com
Maintaining optimal levels of vitamin D (59% of Americans have levels that are depleted, or deficient; 95% for those with greater melanin pigmentation) will reduce the risks of contracting many diseases, and speed recovery.
The govt. RDI of 400 IU daily is long outdated, according to vitaminDwiki, and Dr. John Cannell, at vitaminDcouncil.org, Dr. Weil, at drweil.com, Dr. Ben Kim, at drbenkim.com, Dr. Axe, at draxe.com, Dr. Gominak, a neurologist at drgominak.com and Dr. Mercola, at mercola.com all agree that an RDI of 5000 IU daily is not excessive, although higher levels may be required as people age, and / or put on weight. My doctor, on the basis of several peer reviewed studies, also agrees that an RDI of 5000 IU daily is not excessive, and it is virtually impossible to get the required amount from dietary sources, without the risk of toxicity.
There are currently differing medical opinions on what is the ideal range for achieving maximal benefits, with minimal risks; I formerly adopted 45-52 ng/ml (115-128 n mol/l), but am now opting for 60 ng/ml - 80 ng/ml (150 n mol/l - 200n mol/l) with 60 ng/ml (150 n mol/l) as my target.
Vitamin D is not a true vitamin, but a hormonal substrate (secosteroid) that is vitally important for the activation of almost 3,000 genes in the body.
VitaminDcouncil.org has low cost, blood spot vitamin D testing; click on testing at the top of their webpage.
You could enhance your microbiome (both the beneficial and harmful bacteria in your digestive tract, which produce a large proportion of your neurotransmitters, and some vitamins) by regular consumption of fermented foods, such as sauerkraut, tofu, soy sauce, or natto, and take a probiotic, preferably one with an enteric coating. Perform an internet search for supplies.
Adopt a diet with minimal sugars and / or highly processed grain products, with more non starchy vegetables, protein, some complex carbohydrates, such as legumes, (beans, peas, lentils and chickpeas) or brown rice, some sourdough rye bread or seed and nutloaf, and 2, or 3 pieces of fruit, as well as probiotic yoghurt.
I distinctly remember runny nose and inability to focus being associated with vitamin D insufficiency, although I can't pinpoint the source article(s), and have spent a fair amount of time looking for them, but failed, so have to move on, but I suggest that you educate yourself on the subject, and test tomorrow!