I am just 20 years old and I have a problem of low blood pressure feeling pain in head, sholders and feeling sleepy all time? Is there any serious prob

Go see your doctor. I can't tell you whether it's serious or not because i don't have a diagnosis for you. You need to go see your family doc who can determine if there's a link btwn your symptoms or not. And if so, whether it's serious or not. Low blood pressure could be due to anemia which could make you tired. Cause of anemia may or may not be serious. Lots of other concerns especially regarding pain. Go see doc.