Fear of Meals Away From Home

I've been focusing on my health and fitness over the last year and feeling good about myself. I have been tracking all my macros but one thing I can't get past is the anxiety and dread I get when it comes to eating food away from home (or from what I have packed from home). It is to the point where I am avoiding family gatherings and visiting my partner's home because I don't want to be in a situation where I am not in control of what I eat. I'm so frustrated because I never was like this before but it's causing me a lot of distress.