One thing remains that could correlate with your symptoms. This is not common, however, in some cases you may have either not gone deep enough into the muscle, or simple landed in the wrong spot. Oil can leak and travel in between your muscle and epimysium sheath. With quad injections, it's likely to pool up at the knee. This can cause some irritation over expanded areas, beyond the injection site. It also prolongs/extends absorption time, leaving you with discomfort for extended periods.
This was from another post.
steroidology.com/forum/anabolic-steroid-forum/659203-quad-swelling-finally-went-down-but-s-time-pinn-again.html
The reason why I post this it seems you have a large pool right above your knee so i could be wrong.Was it a 1 inch needle that you used?
Get well soon.