Recommendations for chronic fatigue management

I’m 16 years old and a junior in high school. The cold weather has really done a number on me and i’ve been flaring. I’m fine when I’m sitting but the second I stand up, it feels like all the energy sucks out of my feet into the floor and moving around feels impossible. I have a cane and forearm crutches for mobility issue days but they always seem to take more energy to use than they save (maybe that’s just me?) I know I need to take care of my body, I just don’t know how to do that in my situation with a two level school and high intensity courses that I cannot miss. If anyone has any product suggestions, tips, or mobility aid recommendations, I would love to hear them.