Hi! welcome to HCM! A bulging vein at the head may be normal and may also disappear on its own. It could be due to high blood pressure, temporal arteritis or primary headaches such as tension headaches. Tension-type headache pain is often described as a constant pressure,Itis the most common type of primary headache. Various precipitating factors may cause tension-type headaches in susceptible individuals like Stress,Sleep deprivation ,Uncomfortable stressful position or bad posture ,Irregular meal time or Eyestrain . As you said you had a stressful meeting it can be a tension headache. pain killers and muscle relaxants will provide relief .I f it persists, it is best that you go for proper medical evaluation. Direct clinical examination is essential. Take care!