gain weight celiac

Hi, I have just been diagnosed with Celiac disease. I never picked up on any of the signs except the weight loss. Over the past few months I have dropped a lot of weight, and am now down to a scary 49kgs. I have been GF for a week now and am starting to feel better, but still no weight gain. Does anyone have any tips on how to gain weight by being Celiac? And will it take a while for my stomach to heal before I will start gaining weight?

Any help would be most appreciated, as I’m starting to get concerned with how skinny and malnourished I am looking.

Cheers,
Lucy