Pedialyte.
Start with a few teaspoons every 5 minutes. When they can drink without throwing up, try giving larger amounts.
Supplements that 'claim' to promote relaxation and less anxiety include
Gamma-Aminobutyric Acid
L-Theanine
Lemon balm
Passionflower
Melatonin
However, there are more ways to relive or help relieve anxiety and stress like
Meditation
Getting a massage
Taking a mindful shower
Going for a walk
Using your favorite lotion while using your 5 senses
Playing a game, going out with friends, solve a puzzle or logic problems
Do something artsy
Reading
Just taking a break from the situation
Listen to music
Write a letter, write down your thoughts in a diary/journal, talk to someone supportive
I listed some of the main ones that are commonly used but just do something enjoyable. This wont solve your problems or completely make you feel better but it can give you a break which is something we all need at times.
Other things like antidepressants or things for anxiety may be needed if you are constantly feeling this, there could be a unknown disorder your battling through like, an anxiety disorder, or something of that nature.
The following work out "curl ups". This would most likely be when you would have to be laid down, and when you would have to "curl" you back up. And by doing this kind of workout, this would give you muscular endurance in your body, and not only that, but this would also give you (a lot) of strength. So based by looking at your options, your correct answer would most likely be
(D) Both A and B.
The answer is vaccination! hope this helped ;)