I am having extreme difficulty get up from bed o after sitting for last one month. surprizingly there isn't any pain when i stand straight or walk.

Check Thyroid: Thyroid deficiency can cause fatigue and or difficulty in getting up in mornings. Your doctor can check for other mineral or vitamin deficiency, which can start after middle age

Muscle weakness: Difficulty getting up from the bed or sitting position to the feet may be an indicator of proximal muscle weakness. The reason for that weakness may vary , but to make the diagnosis, it needs a physical and some labs, see a neurologist.