Hi
As you said you are an IT professional , the symptoms you were saying might be due to long duration of sitting hours and as in this pandemic you must be working from home so please do check your sitting posture, chair or couch you sir to work. Please take breaks in between work and do little mild stretches for back.
This vibration might be due to muscle soreness. Try ice packs over the thigh and then do stretches.
Next Steps
Please do keep a watch on your weight and do some walking everyday for 45 mind which alleviate your symptoms.
Health Tips
If you want to know more details , consult me.
Take care.