Thanks for your replies, everybody! 
@1kgcoffee, to be honest I have had a mitochondriopathia (=very low ATP-levels) because of high nitric oxide levels in my body and have had many severe vitamin/ mineral deficiencies because of that. In the past six months I almost have cured (with the help of my doc) that sickness and I have almost no more deficiencies now.
Because I also had low Vitamin D levels my doctor prescribed a Vitamin D3 supplement to me. But I got severe joint pain from it, nausea etc. When I asked him he couldn´t believe somebody´d have problems taking Vitamin D. Some weeks ago I found out this might be because of a lack of Vitamin K2. Since I started taking MK-7 I have almost no more problems when taking Vit D. In the context of my underlying disease Vitamin A deficiency is very possible and I´m relying on a Vit A supplement, because my body cannot convert carotenes at this stage. But thanks a lot for your help so far though! 
@dankis, since I got that mitochondriopathia I still got some nutritional imbalaces in my body so I think I will go the safe and slow way 
@onyomi, I´m sorry to hear that. Have you taken any other supplements exept for MK-4 at that time?
@Luminosity, what do you mean? 
@GodofSmallthings, have you taken any additional supplements to MK-7 and Vitamin D? And how much Vit K2 were you taking daily? And is there any noticable difference for you between just taking MK-7 and taking MK-7+MK-4?! 
Thanks a lot again! 
Yours
Nana
Hi Nana,
You can read more about my experiences with K2 in this thread:
http://www.longecity...-to-vitamin-k2/I'm curious about the mitochondropathy because I believe I might also have high nitric oxide. How was this diagnosed and treated?
I also have the problem with vitamin D causing me stomach cramps and a feeling of being tense. K2 did seem to help, but I don't dare take it anymore due to side effects described in the other thread.
It's very frustrating: I have found a ton of people online complaining of cramps from vitamin D or heart palpitations with K2, both of which I have, but when you ask a doctor, they seem to think you're crazy--vitamin D
just couldn't do that, they seem to think. It's especially frustrating to me because this reaction of mine to D seems to be acquired. I used to be able to take it with no noticeable reaction whatsoever, and now, for some reason, I just can't.
I'm almost getting to the point where I just forget about it, as it almost seems like my well-being and vitamin D levels are
inversely correlated. Recently I was happy because I had switched to opening the D capsules and rubbing it into the skin, as was suggested as a solution to stomach cramps. This seemed not to bother me and I was using 3,000 IUs a day this way, and also feeling calmer and sleeping better lately. Then, my doctor tests my D levels, and they're even lower than before! I guess it probably wasn't absorbing much through the skin, after all. Today I take a pill orally, and stomach cramps again. Moreover, when I thought I was feeling better due to being able to take more D, it seems my D was actually getting lower! I also tend to be more anxious and depressed in summer than in winter--a kind of reverse SAD, so there's that, too.
Edited by onyomi, 26 January 2014 - 02:16 PM.