Well, as mentioned in the japanese news article, Pata also suffers from Colon Diverticulitis. And treatment usually consists of restriction to only fluids and/or nutrition by IV (in combination with antibiotics.) So it's not exactly that he couldn't eat but more like he wasn't allowed to. Anyway, if he's getting treatment and actually getting better that's great news!
THIS... while by no means is it a fun condition and can certainly be dangerous if left unattended, the whole shpeel about Pata's condition so far seems to have been rolled up in a healthy dose of Yoshiki-drama.
Meanwhile, Yoshiki is casually hanging out in LA (and posting about it) while pissed off fans who lost money travelling needlessly to London are left out. Would have been a pretty decent gesture to at least fly in for the day, do a quick meet and great, maybe a free mini concert with Toshi for ticket holders ? That would have certainly showed good faith and true appreciation towards their fans but... yeah no.
Gotta love the comment about asking other X-Japan members (including Yoshiki himself) filling in for Pata on the album's guitar recording.. that shows just how far they still are in the process.
As for the documentary, the trailer is neat but confirms it should have been titled My Life - Yoshiki more than We are X..