These­ symptoms signify heart trouble. It could be a he­art attack or angina - artery blockages. But muscle strain and indige­stion can also be possible causes. If fee­ling such things, talk to a cardiologist

Seek medical help if you have been having hip pain for more than 25 days. Orthopedist will be the specialist to go in this situation. There could be the need for imaging tests to determine the source of the pain and the best treatment options.
 

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

Regarding what to expect 5 months after knee replacement - If there are no complications then you can work freely as per your wish.

But after knee replacement, some patients do not recover as quickly as others. Consider the following:

• Patients who conducted knee-strengthening activities before surgery have a better chance of recovering faster.
• It may take longer recovery time for those patients who are older, smoke, or have other medical concerns.

Note: Although deviations from the "normal" recovery timeframe is not always expected, but such fluctuations are usually acceptable as long as the patient, doctor, and physical therapist continue to collaborate in the pursuit of a complete recovery.

An outward roll of the ankle may cause immediate pain and swelling, so an eversion injury is likely. There could be mild fractures or other problems missed by the initial examination or X-rays. I would advise you to get it checked again, if not much progress has been made in the next 3 weeks even while using an air cast for support.

A bulging disc pressing against nerves can cause pain and affect your balance. Falling is dangerous. You better go back to the hospital. They might have to change your medicine or try something else. 

The redness, bleeding, and pus are signs that your wounds might be infected. It's important to keep the wounds clean and dry. Use Betadine for dressing, as it helps prevent infection. Avoid putting too much pressure on your leg wounds to reduce bleeding. Your wounds will heal with time. 

Looks like you're suffering from a lot of backache. Even though Lyrica and Neurontin kinds of drugs are being taken, back pain may worsen, and this may be a brand new problem or the deterioration of what used to be. You have to meet your doctor for a check-up to diagnose the cause of the recurrent pain. Sometimes, it is necessary to change your meds or use additional treatments to reduce the pain as much as possible.