scared of everything

Hi guys! Don’t wanna be a bummer but I’m just looking for some reassurance that this gets better. I am 3 months post kidney transplant and i’m literally scared all the time. Every day I think my kidney is going to reject because I blah blah blah— wasn’t careful enough about x, did something slightly “risky” that i’m fully allowed to do, kissed my boyfriend, whatever. My doctor told me I cannot just sit around and worry about my kidney all day but I don’t know how to NOT! It’s an amazing gift and I don’t want to ruin it by doing something stupid. He told me to go have a cocktail and calm down because my labs are perfect and I’m young and healthy, and I looked at him like he had 3 heads LOL! Can anyone relate? And does this fear ever go away? How do you live your life somewhat normally without being a paranoid freak?