Breath deeply and slowly. Take a short walk if you are not in time pressure.
Might work :D
I have the same problem when I'm in any tense position, doesn't matter if it is an unfamiliar opening, in the middlegame, or in the endgame. Sometimes, the nerves stay frayed and I just try to take my time (if I have time) and do the best I can.
whenever i entered into the last stages of game, i always become anxious to go for a good move and sometimes becomes nervous in afraid of wrong move ......
how do i control my nerves in the last stages ???