I feel sensitive and weak teeth and jaw, difficulty in chewing food and then after few hours or night's rest i am fine... what is it due to? please ex

You may a bad bite: Or TMJ issues. Find a neuromuscular dentist in your area to help you.

Need dental check up: The most important thing would be toget a dental check up if you have not got..Periodontal disease ..Moderate to severe where if teeth have mobility and roots are exposed can cause sensitivity or teeth can feel weak..Dental xrays will help with diagnosis.

Needs to be seen: The internet is wonderful for many things. However, these types of situations require a one on one clinical exam, x-rays and an evaluation by a dentist. Merely giving you a list of possibilities will not serve you in any way. Set up an appointment with your own dentist and feel better soon.

See a specialist: The duration and/or severity of your symptoms should tell you that a specialist should be seen. Trying home remedies may make things worse.

Many reasons: What you explained can be because of a small matter such as bruxism or pulpitis to a more serious, urgent problem like infection, jaw fracture, etc. So it is very important you see your dentist or ENT asap.