Oh hun, I felt the same with my first baby. It's exhausting and overwhelming, but it can definitely get better.

What's his sleep like overnight? What worked for us is routine. So getting him up at the same time every morning and putting him down at the same time every night.

If you're really desperate you can consider going to a sleep school, but it's possible to do it yourself at home. It takes trial and error, patience, commitment and support from your partner. All things that probably seem tough at the moment because you're so tired... But it'll be worth it when you see the benefits.
Where are you located?