Intense knee pain?

So,I've lost 46 lbs and my surgery is scheduled for next week. However, started a fitness plan and since the first day at the gym, I can barely put weight on my left knee. Its to the left of The kneecap when looking down at it. Very upsetting due to lack of meds I can take for it! Any suggestions other than ice?

Surgery next week. Cool. I would alternate heat and ice and stay off of it.

Good luck with your surgery