I answered this question for you in another section, but I didn't know you had fibromyalgia. With fibromyalgia it could be difficult to exercise. I had FM sypmtoms for years. It took a long time of dedication to "natural healing" for me before I succeeded in getting well.
Is it hard for you to exercise? The best way to gain weight properly is through a healthy diet and exercise, in my opinion.
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I Wanna gain weight. 
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