> I feel a kind of pain in my throat, like a
> muscular spasm, it doesn't interfere but worries me a bit. Can I do
> something to stop this, do I do something wrong?
I have had sensations in the various kundalini during contemplation, it
subsided after a while. Every once in a while I may be aware of such but I
feel no concern over it. IMO it is an indication of progress.
> And second, sometimes, when more focused, I have the feeling of
> splitting in two, a part of me (the "brain") is getting smaller and
> smaller and the other part (?) is growing huge, sometimes like a
> pillar, sometimes more like an ovoid, reaching towards the sky.
> This morning it was different, like a sphere of dense and bright
> white light, surrounding me like a soft cocoon, almost material, it
> felt great, soothing and fulfilling in the same time. I didn't want
> to leave it (had some difficulty getting out and it was one of my
> longest meditations) and had an urge to fill the sphere with love. In
> the same time my body felt like a whole, couldn't differentiate
> between its parts. Am I on the right track or completely out of it?
I would say you are doing quite well. If you get the opportunity again
filling it with love sounds like a good thing to do.