Feeling discouraged by exercise restrictions

I’ve been put on lifting restrictions and limited to walking as exercise due to SCH. I understand why I have to do it and I will stick to it until doctor clears me but I’m a bit disappointed. How much muscle should I prepare myself to lose if this ends up being a couple month restriction? I’m what I like to call “fit thick”. I’m technically overweight with above average BMI but I have a higher muscle mass. Use to doing hour long cardio works 3 days and week strength 3 days a week. I haven’t been very good with protein either unfortunately due to aversions. Eggs give me the ick 6/7 days of the week and meat has also been finicky. All that sounds palatable is fast food or very bland things 🫣 Getting like half the amount of protein I’m use to.