Many people switching to a lower fat raw diet have reported a stop to their hair loss.
Also inclined to suggest that either too much fat or bad food combining may be contributing to your GI issues.
Some people think that extra fat helps gain weight, but you really want to look at a higher calorie consumption. Extra fruit will help out with that. Also weight bearing activities.
www.rawfoodexplained.com has a ton of info on raw, fasting, nutrition. etc.