Hitting calorie surplus!

Hi All,

So I've been a member of My Fitness Pal for about 7 months now with proper tracking and goal setting. Last year I weighed 17 stone 3 lbs and managed to drop to 13 stone 11 lbs, which I am now. Ever since losing weight I've felt so much healthier and better in myself. It is also so so so important for me due to my heart condition too and excess weight, which I had, could’ve caused damage to my health condition.

Now, I've lost the weight which is brilliant, and I currently go to the gym, and I have a personal trainer who helps me with nutrition and creates tailored-made programs for me to follow for a month and then review the following month. Last Friday, he set me my calorie intake and macros for bulking up a bit, and also designed a new programme to follow that targets most of the main muscle groups all in one workout. Now I'm fairly new to all of this and just need someone who may have been in my shoes before to give some helpful advice to me. My calorie intake per day needs to be around 3,229 calories, that is 74g of fat and 158g of protein a day; however, I am meeting my fat macros and protein macros almost every day, but I am only consuming around 2,000 odd calories, sometimes even less! I don't want to see any more weight loss, but I want to see muscle mass increase on the scales at the gym. Now I know it takes time, dedication, effort and motivation all of which I have. I usually treat myself every payday, so the end of the month, to a meal out at somewhere like Nando's or Pizza Hut but I don't go overboard!

Anyway slightly off topic there. I want to know how I can meet them calorie goals a day without going over my macro targets which I am currently meeting but with only 2,000 odd calories. I use Joe Wick's Lean in 15 books to give me meal , dessert and treat ideas and often adjust how much grams of chicken I will have with a meal or have much grams of peanut butter I'll have with a meal and so on. However, my calorie intake still isn't being met. (by the way, I’ve followed Joe Wick’s book throughout my weight loss journey)

Please, could someone help and advise me. To summarise, my goal is to now bulk up and add some muscle mass now I've lost the three stone, my goal for protein is 158 grams and fats 74 grams which I am meeting, but I am not meeting by calorie surplus goal which is 3,229 calories-roughly-a day. Also don't confuse me with too much technical information, if someone could help me with a basic explanation and some advice on what to do then that would be very much appreciated.