My sick bf is moody and all he does is snap at me... Why is this?

My bf is sick and I tried making him feel better by staying and taking care of him the other night; but he has been so moody. I tell him that I love him and suggest simple things to help get him back to his old self; instead he either ignores my texts and calls or his just says one or two words like, "mmmm," and "ya". I started to think maybe he was upset at me for something; do I asked him and instead of simply saying, "no." he snaps at me to "stop freaking out!" I don't know what his problem is. I've tried to be nothing but nice to him and all he does is get moodier. Should I just leave him alone for a few days, give him space? What should I do? Please help?
My sick bf is moody and all he does is snap at me... Why is this?
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