How To Treat Guillain-barre?

my husband had a reoccurance of guillain-barre and he is doing better, slowly, but his sexual libido is almost completely absent. I struggle with CRPS; so we both have had to learn how to cope with one another and continue to parent a teenager. So despite pain, fatigue and loss of stamina my libido is returning(I'm 64) but his lies dormant (He is 52). He had a stronger sex drive before his relapse. I am starting to get very frustrated; in fact, if it weren't for reliable vibrator, I might be driven to finding a lover. Doctor, do have any suggestions? I'm open to anything. He has tried Horny Goat Weed. Thanks, V