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You can control your sugar level by adopting following dietary guidelines
Take all vegetables except potatoes, yams and turnips. take these three vegetables in moderation( 2-3 times a month)
In fruits avoid mangoes, dates, grapes, bananas( if your
glucose level is under control you are allowed to take 1-2 slice of mango, handful of grapes, 1/2 banana but can't take dates. One more thing you can take only two servings of fruits in a day. You are allowed to eat apples, peaches, guava, strawberry, apricots(3-4 in number), melon and water melon( 1 slice in a day), pomegranate ( 1 small size), tangerine/orange( 1 small size in a day)
Take boiled rice once a week( remove starch)
Avoid carbonated beverages, even you are not allowed to take sugar free drinks. Avoid Bakery products. Can take sugar free biscuits. Do 30 minutes brisk walk daily as this will help in controlling your glucose level.
For weight gain keep in mind that you should eat something in short intervals but include those food that keep your sugar level under control.