Emetophobia

So I have Emetophobia (an anxiety fear of throwing up, seeing someone throw up, hearing someone throw up, making yourself feel like you have to throw up, making yourself feel sick.) and it's really really bothering me today. I drank last night and then pooped this morning and ever since have felt sick since. I have really bad anxiety and today it's really bothering me. So my boyfriends Grammy is coming over for lunch in a few and since I drank last night and felt like I was going to throw up from it but didn't i feel sick this morning and I'm too scared to eat because I feel like I'm going to throw up in front of everyone... how can I calm myself down, I've been trying to stay comfortable and not freak out to much but I'm shaking and getting really bad anxiety because I'm so nervous that I'll get sick while having lunch. I've known his Grammy for a while and I only get nervous sometimes when I eat with them, but today it's just over the top horrible anxiety and I want it to go away...