Huge improvement with vit B complex, but what's the original cause?

After 7 years of peeling lips and angular cheilitis I had a tremendous improvement after taking B complex for about 3 weeks. I stopped the course one month ago and still no sign of soreness on the corner and my lips are almost pink (for years people were asking me if I had red lipstick and it was horrible)and the peeling is minimum only a little bit on my lower lips and I din't have to use any cream or any antifungal of anykind. Every six month I have a full blood tests and there isn't a single thing out of place .
I'm gluten free since 9 months.Stool test were ok. I was suffering with occasional diarrhea(mostly at night) which stopped after I went gluten/cow milk free. My gastroenterolgist told me that I'm healthy and diagnosed me with Irritable Bowel and too much stress and worry about my life.

Of course I'm happy (althought I'm scared of saying that I'm cured), but I'm wondering how is it possible that 7 years ago on a normal day while goin to university I developed this cheilitis and this deficiency??? Hope someone can help me to understand.

Luca Tweet