There is a period of pain that you're going to have to push through, that's how starting intense physical activity works :) Especially if you haven't done it for a while or ever.

Though if it's actually really bad you might need to consider if you have any long term injuries you may not have realised you had or been attending that might need to be worked with/around, and perhaps throttling back a little bit (maybe cutting back to once or twice a week if you're doing more than that) and easing in again XD