Hey SG,
If you're really losing this kind of weight it's likely mostly diet. Not enough time has elapsed for you to have lost muscle gains solely from missing workouts. In addition, you're still lifting your legs. As long as you keep doing legs low volume high weight you can actually even continue to make upper body gains... Yes, gains. No, I'm not smoking crack.
When you lift legs heavy you pump out all the good hormones that help optimize your muscle gaining potential. That is, you make yourself anabolic. Keep doing your leg workouts. Do whatever little else you can (even if it's just training your grip strength). Even the most remote muscles send signals to your endocrine system to pump up the volume. Your blood in turn touches everything, so even if it's your legs causing the increased hormone secretion, your upper body will benefit.
Also, what are you doing for this pinched nerve? Are you sure it's a pinched nerve? If so, are you doing all the anti-inflammatory stuff? I've found even just arnica gel (you can get it at any health food store or CVS) works really well to keep local inflammation to a minimum.
Then, yes, optimize your nutrition. It sounds like you've been doing great on this but google "anti-inflammatory" foods and try to incorporate some of this. Fish, good vegetables etc can be good for all of this. Most importantly eating well will keep you from feeling like crap which will keep you from feeling sorry for yourself eating bonbons on the couch. This is a setback -- not the closing scene.
We are all here for you. Get creative. I'm sure there is a ton of stuff you can still do but it's gonna take some innovation (one thing you might consider doing is splitting your leg day into two days -- one with glute and ham focus and the other with quad focus... Also, if you havent already seen a physical therapist I highly recommend it -- those peops are the only reason I can still walk!)
Good luck, sista. Don't talk to loser punks at the gym. They're all jealous anyway.
xo, C
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