Translated by Genny SS:
About 2015, Rafa says it's been the worst season but you have to accept it, accept you're not that good or don't have to be always that good.
Sometimes you play better & sometimes you play worse. $CUT$ Other seasons he had injuries, but not this time. He simply was not good.
He kept motivation to go on working but anxiety & bad feelings on court made things difficult,as he was fighting himself more than opponent.
It took him time, more than past half season, to overcome all this. At the beginning of the season he wasn't playing well, but feelings were not good & thus he could understand it. More difficult to understand was when he started to practice well & w/better feelings, but then he was unable to do the same while on competition. Rafa says he understands you may need to resort to external help for some personal problems, but he's not keen on external help to overcome all this, he's happy with what he has & w/the effort of all: his family, his coach, his team they've managed to go ahead. The defeat at Wimbledon was tough because he had done a good preparation & practiced well. Though he was coming from losing to ND in RG (playing a very bad 3rd set), he thinks he had given an step forward in his game. And not only in RG, in Rome he had lost to SW in a match he shouldn't have lost the way he did, but he'd played well at the tournament. Same about Madrid, where he reached F.
So, there was a positive evolution. Then he worked well to get ready for Stuttgart, where he won... but in Wimbledon in his match against Brown he was totally unable to control himself, his emotions, on court. That was a really tough moment. From that point onwards tho, things improved. It wasn't easy, but he won in Hamburg. And then in all the North American tour (Montreal, Cincy & USO) the good feelings went on.
He was also feeling much better, both at practice & competing. He didn't have the anxiety or bad feelings he'd had in previous months, even though the results didn't show this improvement & when this happens you can lose confidence, but he kept going, knowing things would improve
Beijing & Shanghai meant a big step forward and then Basel & Paris confirmed the improvement. He was able to beat players who were or had been top-10 & it happened on the surface least favorable for him. Being fair & realist, Rafa considers that in the last part of season he's competed as he's always done, not worse.

More read here: http://rafanadal-kingoftennis.ru/news/video_rafael_nadal_talks_about_his_season_2015_in_an_interview_in_manacor_dec_2015/2015-12-25-3020