@Junction1966, welcome to the forum. I can certainly relate to your pain issues, which can be caused by mr parky or due to parky and, (not saying it is I your case), a change in the way we walk and reduced physical exercise. Good advice already given by Jane L & Corrine so not repeating it here, and the could be many reasons why it is happening so do make the call.
I have tried many forms of pain relief and exercise regime’s as well as having my meds altered several times over the last 4 and half years. As we went in to lockdown I took up Jing Qi Shen Gong sessions via zoom. It’s has helped with my balance, coordination and by strenghting my core muscles and it has helped with pain. It is a healing form of Tia Chi and as you start it is a very low impact, but as you progress and if you want to the routine can become more demanding as you extended the depth of the movement and the number of repetitions. But for fullness I will also say that my meds have been increased so I take more Sinemet and Sinemet CR as well. So probably a combination of both. But certainly my balance & posture improvements are because of Jing Qi Shen Gong.
Take care, stay safe and speak with your Parkinsons nurse, if you have one, and call the helpline I know that I have received a lot of advice from them and also fellow forum members.