Lots of friendly ears on here, Sarahlou, though I'm afraid I can't be too much help 'cos I'm Type 2 and fat :roll:
What I can give you is my constipation tip! 4oz rhubarb stewed with Splenda as a sweetener, served with live organic yoghurt ( I prefer sheep's) and some flax seeds. According to my calculations that's about 6 grams of carb. Otherwise, fresh figs - about 10 grams of carb per fig, but nice! Also lots of water is supposed to work.
The only suggestion I can give you about upping your calorie intake to gain weight is to try more fat - if you can tolerate fat, of course. There are medical reasons why some people can't. Cheese and nuts are lowish carb, also avocados. Butter (or oils and good margerine/spreads) and cream wherever you can get them in. Very dark chocolate - 85% proof - is about 16 grams of carb per 100g, which is a whole bar. If you make that last over 4 days, it's not very high carb but you take in 61 grams of fat! Check the labels - different brands vary a little.
Obviously you must check all the above to see if they suit your health and your diet and carb intake. But if you can take fat, as a vegetarian I think it's the only way to go without increasing your carb intake too much. Just a little extra fat here and there will make a difference to your calorie intake. I'd be interested to see what anyone else thinks.
Let us know how you go on.
Viv
PS I can tolerate fat, and eat quite a high fat diet. But I'm losing weight, and my cholesterol is okay. There's no need to be frightened of it, and you don't need to go too high - every 10 grams of fat is 90 extra calories. It all adds up.