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This is pretty common after vaccines. Keep an eye on his breathing. If it is troubled, you may want to give your vet a call as this could be an allergic reaction.
Many vaccines are given intramuscularly so they can cause some pain and fatigue, must like when a human baby gets vaccines.
If you don't start to see some improvement within the next 24 hours, you will want to see your vet.
Let me know if you still have questions.
The vaccines are usually killed vaccines so there is not much change of him getting the disease from the vaccine.
I would worry more that this is a parasite problem. If you have not yet seen the vet for a fecal exam, you will want to do so. Over the counter wormers don't work for all worms and they don't work for giardia and coccidia.