Is there such thing as a silent stroke meaning without headache?

Most without headach: More than 85% strokes occur without significant headaches associated with them. When you say "silent" stroke I think what you mean is a stroke which there are no obvious neurological deficits. Those can and do occur. Talk to your doctor if you think there might be a problem.

Most strokes are: clinically silent, i.e. no symptoms which the victim, much less physicians, recognize. With the best current MRI brain scanning machines, despite their limitations, evidence of previous strokes are seen in the general population in seemingly clinically normal people by their mid-30s. Bleeding/hemorrhagic strokes, with tissue stretching, are far more likely to also have associated headache symptoms.