Try not to worry about the form, I agree that the dr might just think he wrote it or he will understand that you just thought he forgot to put it on so you added it. I'm surprised he didn't put it on?? Ask for a print out of your results if he doesn't discuss the level and your too scared to ask the result.
I think it is completely fair of you to return the blanket now. I would say thank you for the kind thought but you are too worried that something will happen to it while you have it and you'd rather return it. I don't think that's at all offensive. That's kind of odd even though she meant well I would be exactly like you and not want to even touch it.
It doesn't matter what other people think you should do! As hard as it is try to block them out, it is so irritating when people think they know what's better for you when your quite capable of deciding it yourself. Hang in there sweet heart, thinking of you today xx