You're losing weight?? I'd guess most gain weight when reducing activities..

There are exercises/activities to maintain fitness , that might avoid added symptoms.. Main thing is usually avoid straining like lifting weights or lifting machines...and other head hitting risky activities. Like contact sports & such..

Various types of Yoga, tai chi, floor work, stretches, balance ball/ foam roller
walking/power walking if tolerated
stationary bike/ treadmill if tolerated..

Slow & easy is better than pushing thru any symptoms..or having increased symptoms..