Oh, you poor thing. It takes me a good few days to feel close to normal and a few weeks to really clear up after a big reaction. I'm ana to shellfish, discovered as an adult, but my parents never ate them, so it's unclear if I had it as a child. I have many other food allergies, which my parents always viewed as me being an extremely fussy eater. Luckily I was stubborn enough to protect myself!
Definitely avoid all nuts, seeds and legumes (peanuts) for now. I tend to focus on soft nourishing foods like soups and stews while I recover.
My in laws come from a culture that eat a lot of shellfish. It's easy for me to avoid temptation, because the smell makes me ill. But cross contamination in preparation spaces does cause me grief. I take antihistamines for a week before sharing a meal with them, on advice of my allergist. They live far away, so that helps too!
My husband and kids are hugely supportive. They decided not to have shellfish in the house and if they eat some in a restaurant, they brush their teeth and thoroughly wash their faces and hands before coming near me.
I have an EpiPen on hand at all times, but I've never had to use it touch wood
Hope you get your appointment soon. It's good to know what you need to avoid, takes some of the fear out. Good luck.