26 year old female. bad headache for 3 days. otc meds don't help. not light sensitive. improves somewhat by afternoon. worsens with movement or strain?

You may be: describing tension or cluster headaches, depending on the movement and location of pain as well as the triggers. If no photosensitivity (light) or phonosensitivity (loud noises), then it is less likely to be a migraine, though migraines cannot be excluded entirely. See a healthcare provider for proper diagnosis and treatment. Thanks for trusting in HealthTap.

Uncover cause: Agree with Dr Doan's excellent advice. Most likely migraine or close variant, but you need evaluation to pin down and decide strategy. Both abortive and preventative meds are available and work well. There are many causes of headaches. See a neurologist and get stabilized.