Why do I feel weird sensations in my feet?

Given your age and history of osteoarthritis, it is most likely caused by the wear and tear on your joints. Losing some weight gradually with a healthy diet could relieve the pressure on the knees. Additionally, physical therapy may enhance flexibility while building up muscles around these areas. 

The accident you expe­rienced days ago could cause this pain. Some­times, injuries make tissue­s in our hands get hurt, leading to discomfort. You must rest your hand and apply ice­ to minimize swelling - raise it too. Give­ your hand a break so it can properly recove­r.

Muscle knots are usually caused by stress. Stress & tension later develops in the form of muscle tightness and discomfort called muscle spasms.
Regarding your slightly high lymphocyte count, if your doctors have reassured you that it is not a cause for concern, it's generally best to trust their expertise. Minor variations in blood cell counts can occur without indicating a serious health issue.

I'M sorry to hear about your son's injury . First, stop any bleeding with gentle pressure.... Apply a cold compress to reduce swelling.. Visit a doctor to rule out any broken bones. Follow any instructions for medication and rest. Avoid putting weight on the INJURED leg. MonitoR for signs of infection, like REDNESS or fever. Contact the doctor if symptoms worsen or persist....