When I get out of the hospital, Is it okay to eat out at restaraunts?

I have been in the hospital since Wednesday going through chemotherapy. I should be getting out this coming Tuesday. My friend wants to take me out on sort of like a get well date. My doctor says it’s should be fine, but I seem iffy about the idea. I feel horrible, I think I look horrible, but I don’t want to miss out on hanging out with him. Also if I do go, how do I politely tell him he is just a friend?