Need Help Gaining Weight and Getting Healthy

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My name is Amber and I am 33. I suffer from Fibromyalgia and have always been underweight. I'm 5'5" and about 96 lbs. right now. I need to start eating right and trying to put some weight on, and I need to start exercising. There is no cure for Fibro but I am sick and tired of being sick and tired. But I'm so clueless on where to start or what to do. Any ideas on how to go about this?