A swollen blood vessel is likely to cause extreme drowsiness, and this symptom is likely to appear shortly after the blood vessel ruptures. If the drowsiness is severe enough, it could result in loss of consciousness. If you are suffering from sudden fatigue that may be connected to an aneurysm, it's important to call an ambulance right away. Survivors of swollen blood vessel in the brain sometimes experience fatigue that continues after the condition has been treated. In some cases, the fatigue may last for a period of several months.Next