Vaseline do an aloe vera gel which is very good as its cooling, but any aftersun would do the job to be honest. I wouldnt be using the sunbed at all if I were you as youve already burnt so it will just go red again.
Liz Earle do a great after sun x
Oh my god so exciting that you're picking up your dress!!! Xxx
Anything by nivea katspups, the original nivea cream is so thick it really moisturises so hopefully your burn will ease and no peeling! I'm so pale naturally I darent use a sunbed I'm the type to burn off the glare of a strong lightbulb! But I've always used nivea if I've caught the sun by accident!
Oooooh exciting dress times! Fingers crossed for you!