What should I do about my period?

So, I'm on day 4 of my period. First 2 days were basically non existent bleeding, it was more like spotting. Yesterday got painful and heavy, with about 50 blood clots coming out. Not I'm bleeding so heavily that I'm changing my tampon every 15 mins and its full/leaking. The pain is immense and my body feels so weak!

NHS 111 online says I should go to hospital, but i feel that's dramatic. The doctors are hard to get into and I have work at 11! I work in a restaurant and dont know how I can possibly do it!

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