Exercise Fatigue

Does anybody have any good tips for managing exercise fatigue??

I so badly want to get in shape but majority of the times I exercise I get awful fatigue that can last for DAYS. I’ve tried low impact workouts such as yoga which has been better but it still can knock me off my feet for a while and I can’t seem to find a rhyme or reason behind when/why. The fatigue is sometimes so bad I feel like I literally can’t keep my eyes open.

I would really love to get in shape for my long term health but endometriosis makes it feel impossible.