Discipline: Claritin

Teenage Son with Severe allergies...need Suggestions/solutions

My poor 17 year old came home today MISERABLE. His allergies are our of control. He normally takes Claritin-D, he didn't have any today. We have been to the allergist, and did the shots for a bit, but the allergist is too far away for weekly visits and for some inexplicable reason his Doctor refuses to give the shots, even if we provide the solution. Anyway, any suggestions? His science teacher suggested wheat grass and vitamin C. Anything else work? Thanks!