Keep bulking. I ran into the same problem when I started my new job a couple years back. I was working in 100+ degree reactor rooms wearing flame resistant coveralls, and sweating like a pig. I increased my water intake and added some extra sodium to replace the sweat lost, and I stuck to more fatty foods like beef roasts and ground beef meals rather than fish and chicken, and carbed up even more than usual. One of my meals I would actually have to replace time to time with an extra protein shake made with whole milk, eggs, oatmeal, honey, peanut butter, a banana, and a scoop of whey, because I would get so hot I felt like I had no room for real food. I brought a blender with me to work. I also learned to prioritise my **** better so I actually had time for a full 8 hours of sleep every night, and in the event that I would wake up in the middle of the night to piss (which happened almost every night) I had a water/casein shake next to my bed ready for me to slam it before passing back out.
I don't have to worry about that now, I got promoted and now I work in the air conditioned buildings doing different/less work
Good luck.