I Started A New Job A Month Ago That Is

I started a new job a month ago that is a little physical demanding. After a week I got used to the movements and felt great better then I had in awhile. My problem is after I get home from work and doing my stuff at home like laundry, pick up after the kids, cook and I relax.... When I go to get up my knees hurts like they are achy and my hands and feet. Once I move around and get moving more it gets better until I stop and sit down again.
A quick overview of myself is I'm 28 years old female mother of 3. I am 5'5 and last time I weighed myself I was 260 about 3 months ago. I don't have any medical issues.
Thanks for your time