I got really bad sunburn at the beginning of my pregnancy too, I went to Jamaica & could hardly enjoy it :/ Tylenol may help though, no to ibuprofen, & just keep yourself moisturized with lotion all the time & it should help, aloe will also help a lot too.
Spray you arms with white vinegar, it will take the sting away. If it is super bad it may take a day or two to work but it helps a lot.
It was our first time next time I will be way more prepared
Just rub aloe vera on your arms n take tylenol ..oh by the way i love santa cruz