About 8 months ago I did a workout with a body building trainer who insisted I break my form and round my lower back on a light set of straight-legged deadlifts after 10 other back exercises, each having around 3 sets. My back was already toast at that point, but I didn't feel any pain while completing the sets with the back rounding to get the last couple reps.
I expected my back to be sore for the next week, but it went numb that night. I felt no muscle soreness in my back, but was unable to lean even slightly forward without falling over for the next four days.
The next time I tried squatting, the normal weight that I warm up with felt hard. It didn't hurt to do it, but I felt like I was doing three times the amount of weight that I was. I wasn't able to do a normal working weight. That night, my back seized up and I could barely roll over in bed without wanting to cry like a little girl. The next time I tried squatting, I wasn't able to even get the warm-up weight and felt my back starting to seize.
I haven't been able to do a back squat, even with very light weight, since then. All lifting caused me major back pain afterwards, even though it wouldn't hurt at all while I was doing it.
I took a couple months off, did some endurance work, and am now trying to build my body back. The endurance work seems to have solved the back-pain-after-workout issue. Also, stretching my hamstrings helps a lot.
Interestingly, I can deadlift nearly as much as I used to and also front squat, but I can't even do 1/4th of the weight that I used to be able to back squat. Nothing except the back squat gives me pain.
I don't have insurance or money to go to a doctor. Has anyone had this issue before? Why can I deadlift and front squat but not back squat?
One other important piece of information: I also struggle with even body weight on back extensions for a set of 15 now.
It sucks being this pathetic.