@Big Bill,
@Australis, again many thanks.
I'll try to water it more frequently, hoping there's still a chance to keep it live.
I've changed now also its position now allowing more light but (not direct sun light)(N-E exposure). I've used Orchid bark to re-pot it; while doing it, I found soil inside, that I gently removed. I'll try to use also food for orchids once every 3 weeks. I've never don it before.
Many Thanks
