Call an exterminator about the bees. They'll do a thorough search of the house to make sure there aren't any holes in your walls where the bees can make a living, and will also ensure that there aren't any wasp nests hiding about. I'm deathly allergic to them as well.
As for the snakes, garter snakes aren't bad for you, they won't hurt you, but they eat the insects and small rodents that ARE bad for you and your garden. Leave 'em alone.
Make sure that if you have any flowering plants that you don't have them next to the house or you're just begging for bees. Keep the plants near the house the leafy kind with few to no flowers or sweet scents.
Good luck.
