Actually, staying slightly active really helped me manage my symptoms. I did daily light walks and prenatal yoga, which kept my energy levels up and reduced body aches. Keep a positive mindset, your body is fully capable of handling this.
Honestly, you can't really 'control' them, you just learn to survive them! With twins, my nausea and fatigue were double, so I just accepted the mess, slept whenever I could, and kept dry crackers next to my bed. Just go with the flow, you've got this!
I totally understand how overwhelming and tiring these symptoms can feel, dear. Your body is creating a beautiful miracle right now, so please be gentle with yourself. Just take lots of rest and let your family pamper you.