Thanks for choosing health care magic for posting your query.
I have gone through your question in detail and I can understand what you are going through.
which is causing you sedation. you should take half dosage of cetrizine along with warm saline gargles and throat rest.
Steam inhalation will also help you.
Hope I am able to answer your concerns.
If you have any further query, I would be glad to help you.
In future if you wish to contact me directly, you can use the below mentioned link:
Wish you good health,
Dr. Srikanth Reddy M.D.