Dear sir, based on the symptoms it look like u r suffering from tension type headache. U are clearly saying when u r happy the headache disappears. So there's nothing wrong with your body. Try relaxing techniques and reduce your stress. The headache will improve. If that doesn't help you we can prescribe you some medicines which will help you. Be relaxed.

You could have a primary headache along with some depressive features. Requires further evaluation. Take plenty of fluids, avoid sleep deprivation, take proper meals.

Looks like Depressive features, needs further evaluation