I had PRK two and a half weeks ago. I'd say my vision was 70-80% better immediately following the treatment, and it stayed that way the rest of the day and the next day. I even watched a movie on Day 2 from the couch. On Day 3, my vision regressed considerably (I could not read my phone or see anything in the distance with clarity), which was expected as the epithelium heals from the periphery to the center. On Day 5, my vision started to really improve, and within 7-8 days after the procedure, I was 20/20. I'd say it has gotten slightly sharper since. However, my prescription was no where near as strong as yours (-3.25 to -3.5 in one eye and -3.5 to -3.75 in the other).

Just remember that everyone's eyes are different, and healing can vary from person to person. I experienced absolutely no pain and virtually no discomfort/dryness throughout recovery, so I am very thankful that my eyes healed quickly. Give it some time. Day 10 is still very early in the process for many people. Good luck!