My friend had terrible pregnancy sickness many years ago and was losing weight rapidly.
I made her an egg custard and later a bread and butter pudding with sultanas.
She ate both without being sick and more or less lived on that for 9 months!
Not really a balanced diet but eggs, milk, bread and sugar plus fruit do provide some nourishment and taste of pudding!
Might this help a little?
I do hope things improve.