How long till things get better?

In april 26. I got my blood-test back and I was told I have very low d-vitamin (wasn’t told how much). Since then I have been taking cholecalciferol 4000 IE every morning with K2. Some nights I take Magnesium Glycinate as well. I don’t take the D-vitamin with fat, did it the first time this morning.

When I started I was pretty tired, moody, felt weak, going up stairs was a hassle. Legs felt weak when stretched etc. Also cold feet and cold fingertips?

I do feel a little better but I can sometimes feel my legs working kind of when walking up stairs etc. when I extend them as well as my arms don’t feel back to as they were. I haven’t worked out in like 2 months and that could also be a factor. I was told to take these for 90 days then do a new blood-test to see.

My question is, how long will it take for walking etc to get somewhat back to normal and arms not feeling weaker? Have I done it wrong by not taking with fat? Im two months in 26. june and felt things maybe shoulda been much more back to normal than it is?

Any input is much appreciated.