Can Lack Of Sleep And Hard Work Cause Knot On Neck?

Hi doc, I am a 21 year old, healthy female. I am healthy and have never had any health issues. I recently lost my grandmother and my father is very sick. I have been under tremendous stress. I found what feels like a a pea-sized knot? on the right side of my neck. It meets with the very back of my ear but about two inches down my neck. It moves when I touch it and it is not too hard. It is actually kind of squishy. I have had for almost a month now and it has not grew in size. My neck is stiff but I feel like that is due to lack of sleep and hard work. What's your oppinion?