Stress

Stress Not sure if im a stammer, but i have a very hard time speaking even with my first language which is worse with my 2nd language (english). I always rambling, mixing up words or forget the words that i am trying to say. Im always nervous so this might be part of or the reason. Im working in an IT international company, and english is needed to converse with my colleagues. so during meeting, i cant even converse with them, cant even explain things without reading a script. Then when they are asking me, i cant even answer them accurately. im so down that this might affect my career.