Protein shakes for weight gain

I was told by my dr to drink protein shakes to help me gain weight since I’ve been losing alot

I bought some from Sam’s club there 200 calories and I’ve been drinking 2 a day and snacking because if I eat meals I feel like that’s when I’m getting sick.

So far I’ve been good. But I haven’t noticed weight gain 😞

For those who did them how long did it take you to gain weight and how much did you gain ?

Should I drink 3 a day? I drink one after I snack for breakfast and I drink the other after I snack for dinner

Again I’m not doing whole meals cause it’s to heavy for me so I guess you can say I’ve been doing half meals?

My dr told me not to do meals since I can’t keep so much down

Should I try snacking more I don’t know what else to do without throwing everything up

(I have hg so this has been a very hard thing with food and even liquids but for some reason the baby is liking the protein shakes lol)