want to build muscle but a bit nervous and confused

So on April 1 of this year I decided to get into shape! I did consider it a healthy lifestyle change and not a diet.. I exercised alot and started eating healthy too. I have tracked my macros since the beginning focusing on low-carb, high protein and moderate fat. I successfully lost 45 pounds and 7 inches from my waistline and felt great????! My issue with this is my job (commercial masonry) is super tough day in and day out. I started feeling terrible-no energy at work and could barley get through the day... It still is like this to a certain extent.. My stats are 36 years old 5'8" and 130 lbs... You see my overall goal was a 6 pack and to lean out.. Well here I am probly around 11 or 12 percent body fat and my goals reached.. Now I'm focused on building muscle and raising energy levels. I currently started to increase calories using carbs b/c I think I'm at my protein\fat maximums.. My macros are p/c/f 190/298/70 I lift heavy as I can 3-4 days a week using a upper/lower split, and cardio a couple times a week. I used to eat only about 100 grams of carbs a day so I'm nervous about fat gain with so many more carbs, but hoping I will have increased energy?! Now onto the calorie surplus... I'm shooting for 250 extra a day but confused about workout days and non-workout days.. Do I add extra calories to my diet?? I currently use a polar h.r. Monitor and burn approximately 500-600 calories at the gym.. If I'm trying to gain do I eat those back?? If so what macros?? P/c/f ? My current tdee is (I think) 2350 a day.. Please any input would b greatly appreciated as im kinda tired of my friends telling me to eat something... Ha