Gaining

If you're throwing up you may be eating food that's too rich in fat/and or sugar. Cut back on fat and sugar until you can eat without getting sick. You may be able to restore some of the fat and sugar later as you get used to eating like that.

I am really bad for dry retching lol , sometimes ill be mid way through a delicious burger and suddenly feel like im going to throw up, what really helps me to eat is to smoke weed lol
alot of days I cant even stomach the thought of food until I get high
but also, eat a variety
like when you sit down for a stuffing session, have it so youve got a pizza, some pasta, some garlic bread and some chicken wings or something.
its sooooo much easier to eat alot of food when you can vary the flavours

Wow.
Layla and Pinkydear responded with fabulous advice.Two of the absolutely most beautiful and transforming gainers Ever! And as evidenced here-Knowledgeable too!
And of course the Legendary Dr. Feeder as well.
You should be in for some terrific gains.
FWIW I recommend snacking on white bread and butter for a cheap and bland food that is all fattening carbs and fat.