why don't you do more research on proper diet and training?
read the sticky in the diet section on bulking. follow that
and then you need to learn how to lift ... you probably don't even work your legs properly. you have a lot of homework to do.
your trainer is trying to rape your wallet offering HGH, don't be a sucker. he will sell you bunk crap and you will lose hundreds for nothing.. that money should be invested in food.
and yes you need carbs to gain weight. I eat carbs after EVERY workout. and I eat healthy. you don't need to be scared to eat bro. carbs are even more important than protein, and 99% of internet guru's disagree with me on that but usually you find out they are some skinny kid with some abs. you want to get big you gotta eat big and you gotta lift big. when I started bulking I would order for two at dinner. learn to love food, otherwise you stand no chance. and work your fucking legs. squats, deads, compound lifts. standing in front of the mirror doing 25 pound curls isn't gonna do shit for you, yet I see skinny dudes doing that everytime I go to the gym. I barely ever do curls, you build arms doing rows, pulls and pullups.. not doing fucking curls like you see on youtube. its all for show
I wish you lived close to me and I would invite you to my gym and you would work out alongside me and you won't be able to walk out of the gym, that's the kind of intensity it takes. and for the love of allah EAT EAT EAT. protein shakes and all that shit is just the way pro's make money off dumb kids endorsing that shit.