Is my exercise-related waistband pain muscular?

The injury that you have described might be a muscle strain or a cervical nerve compression. You should consult an orthopedic doctor or a neurologist for proper diagnosis and therapy. If the pain lasts or increases, do not ignore it.

Tibia and fibula fractures involve­ broken lower leg bone­s. Pain, swelling, and inability to move the le­g characterize symptoms. Falls or accidents commonly cause­ these injuries. Tre­atment involves casts or surgical repair of bone­s. Ice, rest, and leg e­levation help relie­ve pain and swelling. Recove­ring full strength and mobility often require­s physical therapy.

This could indicate a serious ankle injury, possibly a fracture. It's crucial to seek immediate medical attention to determine the extent of the damage and receive proper treatment. Rest, elevate your leg, and apply ice in the meantime, but prioritize getting medical help as soon as possible for an accurate diagnosis and appropriate care.

A cracking sound heard during knee flexion may raise a red flag. It might be caused by the rupture of scar tissue or movement of the joint. However, don't be frightened. Initially, it is not likely that the repaired ACL has been torn again. Still, though, for your good, stay away from practices that hurt or cause any discomfort. Keep being careful, and maybe set up a visit with your surgeon to check that everything is okay.

It is bit difficult to remove femur nail after 7 years but it can be done and better to take opinion in person. Yes this will heal after removal. 

Next step: consult orthopaedic surgeon doctor

For pain relief in degenerative disc disease, 
As per alternative medicine therapy, pain is due to imbalance in the body I.e. acid/ alkali imbalance or yin or yang imbalance
So first step is to give balancing acupuncture points and then target points, when 50% pain reduction is achieved, moxibustion, cupping, electro stimulation and seed therapy, diet tips and physical exercise is given