@Trusylver and
@LaMaria - Thanks for your replies, they are helpful, I appreciate your time. I know that nothing can be diagnosed through this forum, but your advice and suggestions are appreciated.
I did a leg day with the trainer yesterday. I explained what was going on and she did her best to help. Most exercises were fine, full weight with relatively painless reps. The one thing I could not do well were walking lunges, even starting without weight. She was watching and quickly she told me to stop and not to try anymore. I had gotten pretty good with the lunges, with weight, and no pain.
I also felt a bit of pain, less but more than normal, with the leg curls, the trainer had me try the 3 different machines in the gym and we found the one that hurt the least. She said that I did not seem to her to be moving much differently. I do however have a little trouble getting into and out of a chair, and worse getting up and down from the floor.
Things are a little better today, so my procrastination in doing something about it continues.
LaMa, do you agree with Tru, would a physical therapist be the right kind of professional to see?
The trainer is the only professional I have spoken with about this, and I know she is not a physical therapist or a doctor. However she has been doing this for over 30 years, has had plenty of training, is a good listener and tries. She also takes good notes, knows if I am getting stronger or not, and remembers whenever I have a compliant. A good lady. The gym is owned by a chiropractor, but I have always been skeptical, and the trainer does not seem to recommend him...
I have cut back on squats, only doing about 30 a day now, no more 100+ squat days for a while anyway. Squats do hurt at first but as I get going it gets better, something new they did not used to hurt at all. The trainer suggested I try doing fewer reps while holding weight.