You should not take it if you are not comfortable. Get a second opinion. To lose what you have already lost is good so continue to work it.
Of course, I am biased against ingesting chemicals, but you doctor is a professional that doesn't mean he knows everything or how you know it affects your body. He could prescribe something else if he knows you had bad experience the last time.
If I were you, I'd get a second opinion. And try to look at the positive side. Good luck, My Dear. Hugs to you...

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