Hello and welcome to the forum! We're glad you are here and thank you for your question. I'm really sorry to read that you are having such difficulty. That's making life very difficult. Have you been to the doctor to go over all of these symptoms? I am glad you were cleared of a blood clot. Particularly, you should get any chest pain checked out.
Here's information on meniscus tear surgery that is very general. https://www.webmd.com/pain-management/knee-pain/meniscus-tear-surgery#1
I really recommend that you have this looked at again. You could possibly have another tear. An MRI would rule that out. But this sounds like perhaps you have a nerve issue going on either compressed or damaged as a complication from your surgery. That's rare, but can happen.
Did you do physical therapy after your surgery? If you are cleared by your doctor, I would guess that you will be recommended to do physical therapy now again even if you did it previously.
You may also look into arthritis.
Let us know about physical therapy and if seeing the doctor is a possibility in the very near future.