Joint pain?

I'm 5 weeks pp and I'm having bad joint pain. Mainly in my knuckles, wrists and knees. My knuckles feel much better after I crack them but only for a little while. My wrists crack too. My knees are so stiff that it's hard for me to walk up and down the stairs especially when I first wake up. It is a new development only appearing in the last 4 or 5 days. Anyone else having issues like this or know what it could be?