Struggling with Weight Loss Due to Chronic Pain

I've had 2 slipped discs at the bottom of my spine (l4 and l5) and I take pain relief every day and to even get out of bed in the morning, I'm desperate to loose weight but the pain literally stops me doing what I need to do to loose it, I have it all planed out in my head what I'm going to do and the motivation, but when I stand up the pain stops me doing it, I can't even bend without pain, I can't sit for more then half an hour without being in agony and I can only stand for a few hours at a time, does anyone have any suggestions maybe you've been through something like this and found something that helps, I'm open to anything