Losing weight

I’m 240lbs 5’5 anyone have any advice on weight loss ? My bottom half is completely fine I harbor all my weight in my upper body, which causes back pain, I can barely clean my house without being tired. My body starts to ache really bad when ever I do anything physically active ! I just want to be a better me 😫 I’ve struggled with this for 5 years now. I was 135 before my son and I blew up and never bounced back!