Please don't give up hun
You're only in the very early days of treatment with Sertraline and it does take a good few weeks before it kicks in. The secret with particularly the SSRI's is to keep at it even though you're not feeling any better at first, just keep telling yourself that they will kick in eventually and then you will feel the benefit
You could always go and see your doctor and ask them if there is anything that they can give to help you just while you're waiting for the Sertraline to start working.
I know it's hard when you're so desperate to feel better, but just keep going hun because they will work eventually