Mentally and physically tired!!

Jessica
I have a 2yr old and a 2month old. 
Lately my 2yr old has been such a hand ful. 
He's constantly whining from the moment he wakes up till he goes to bed at night. 
I have to remind my self to be patient but my sanity is running thin. 
I though it was maybe cuz there was a new baby in the house so I make sure to set aside time everyday for alone time with us but nothing seems to work. Is this just a phase?? Help!!