What is the best way to help a child with severe separation anxiety cope with their day?

Face their fears: Do not allow the child to "successfully" avoid school or other activities, it makes the problem worse. Reassure the child you are confident he or she has "what it takes" to rise o the challenge. Don't belittle the child ir the problem. Often, there is also an adult involved who also has issues with the child separating. Consider getting professional help from a therapist.