My fingers are numb. Should I worry?

Hi doctor,

I am 55 years old with a weight of 88 kilograms and a height of five feet seven inches. I have severe pain in my back. I am not able to sit or walk or lie down. After having a long bed rest, I am feeling better. After having three epidural injections, I have worse pain in my back, especially on the left side. I continued taking treatment with PRP injection and other epidural and ozone injections. I got an injection on my left knee this time due to pain in it. But still, I have a lot of pain. Two weeks back, I had severe pain between L4-L5 and L5-L6. The pain was sharp and continuous. I also have numbness in my fingers present on my hand and feet especially on my index toe and middle toe around the knee area.