Pls help. Having terrible headache on left back side of head which diddnt go away after taking diclifenac 75 mg. Becomes worse when moving head.

Below. Is this headache more severe but similar to your past headaches, or is this different from your past headaches altogether? If so, you'll need a full exam. Feel free to consult me if you'd like to discuss further.
Lots of options. Often headaches are caused by tension in the muscles of the neck pulling on the muscles in the head. These can often require anti-inflammatories and occassionally even muscle relaxers, massage or physical therapy. There are other possible causes, so you should not hesitate to be evaluated, especially if you have trouble with your vision, any other function, or the worst headache of your life.