extremely sore for a week

hey everyone, for context, i'm a 21 year old former level 10 gymnast. i have worked out off and on through college and have never had this issue before. last wednesday, i did a hiit workout (lots of squat jumps, burpees, jumping, etc) and my hamstrings were pretty sore the day after. on friday, i was still pretty sore but i went to a workout class and did weighted squats and kettlebell swings. i woke up the next day barely able to walk. i have been sore before, but this was nothing like i have ever experienced. i couldn't get my foot up high enough to shave my legs. i couldnt put my legs up on the coffee table while sitting. i couldn't even straighten my knees all the way. i have done lots of stretching, used a foam roller and lacrosse ball, and my sister (training to be a massage therapist) rubbed my legs, but they are still so so sore. it's now tuesday and my legs are feeling ever so slightly better, but not a significant amount. i haven't been able to do any exercise because i can barely even walk. how long will this last? is there a chance it's more than just muscle soreness?