Yep, in 2017. I had my first vitamin d test when I was 20, so no idea when I became deficient as no recent results to compare to.
Initially I had a low mood, not depression, just sheer tiredness and a complete lack of motivation to do anything? I could manage to go to uni and work, but would be completely exhausted/drained after, I turned down every social invitation from my friends as I was bed bound on my days off. Just completely out of character as I was active, fit, bit of a party girl etc. I just put it down to the stress of working full time whilst at uni full time.
Then later on, I had weird skin issues. My skin would bruise easily. My muscles/body would constantly ache, eg walking up a stairs would actually hurt my calves to the point that I’d need to stand aside and recover like I’d just been working out! Again, I’m slim and fit - it just didn’t make sense that I was constantly aching and tired.
Other little things like feeling light headed/confused, vertigo
Turned out my vitamin d level was really low, around TEN. My GP said it was one of the lowest they’ve seen. After about 8 weeks of supplements I felt better.