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This does not sound like distemper. If he ate a bee, he could have been stung in the mouth, hence the chewing.
Because of the seizure activity and the eye problems that you are seeing, you need to see the vet as soon as you can.
For the eyes, you can clean them with saline or water and dry them with a clean, dry cloth. If the gunk comes right back, you are probably dealing with an infection that will require antibiotics.
There is a condition called fly-biting in which the dog constantly bites at flies that are not there. I am wondering if this is what you are seeing with the chewing. This usually indicates a vision problem.
Because of the pain, lethargy and eye problems, a vet visit is needed.
Let me know if you still have questions.