Please see a medical doctor as soon as possible which means a visit tonight to the nearest Urgent Care if open or an ER.
While your new experience of much worse pain might be due to your pre-existing back pain, it also could be any number of other conditions, including a few that would require urgent attention.
Please see a doctor now.
No one is too young nor too healthy to be immune from the sudden occurrence of potentially catastrophic medical conditions.
If it turns out that an ER doctor tells you tonight that your new and worse pain is (only) due to your existing back pain getting worse, you can ask the doctor for recommendations of safe dosage levels for OTC medications and/or a prescription strength anti-inflammatory medication.
Prayers for your healing and good luck!
“Please see a medical doctor as soon as possible...”
Very good advice. Shortly after I graduated from nursing school, I had an emergency call out to assist in a gastroscopy on a patient in the ICU who had an active GI bleed. It was a 50 y.o. female who had recently received her first dose of chemo for metastatic bone cancer. She was having severe coagulopathy issues, meaning that she was having clotting and bleeding issues simultaneously and it was a balancing act to keep her from having life-threatening clots AND life-threatening bleeding. She was getting blood and other plasma components as fast as they could be infused. The first gastroenterologist came and we performed the gastroscopy...there was so much gastric bleeding that we could not see at all to perform interventions to stop the bleeding. He said he could do no more. The family begged the attending physician to call another GI MD and he did. The second GI doc started the gastroscopy and the patient started bleeding so profusely that it was like a volcano of blood and blood clots spewing from her mouth....the doc stopped and told the attending and the oncologist there was nothing that he could do. The family stood there in total shock while their mother bled to death.
And the reason that I relate this story: the lady had been having pains that were similar to disc and sciatic nerve problems. She finally went to her primary care MD two or three weeks prior to her death. He prescribed a pain-killer which had no noticible effect...she went back to him and he ordered a CT scan. She was diagnosed with metastatic bone cancer and was told she had two months to live.
I will never forget this lesson and I always advise to never ignore any symptom.