Well the best thing to do would be to visit a doctor, dermatologist or a hairloss specialist; the last one is usually privately funded.
People, especially women, can suffer Telogen Effluvium after a dramatic event or stressor. As long the thing causing it is stopped, the hair should all grow back after 3 months to a year.
With traction alopecia, the only way to stop it would be to basically stop having tight hairstyles.
What's worrying is the intense scalp pain as that could be due to a number of factors.
Where is most of the hair falling out from and what's the quality like?
Also, guessing from your username, you're a woman right? Because women can have a whole host of reasons as to why hairloss may occur due to their biology.