It's a sleep problem and ur posture during sleeping don't use thick pillows at night and ur appetite is increased as u r being lethargic through out the day And just relax apply hot bag to ur neck u will be fine

Can help you with the next course of action and treatment plan. Would like to discuss in details and provide apt solution. Kindly consult.

Drink plenty of fluids Apply heat pack to your back and neck for 5min twice a day Practice pranayama regularly to deal with anxiety

connect with a call for details discussion regarding the disease and it's management

Need few more details Kindly consult

Thyroid profile ? X ray neck

Could be due to dehydration.keep yourself hydrated If u feel these regularly,please get a thyroid and blood sugar profile tested

Can help you, kindly consult and provide detailed history for proper diagnosis and further management

Feeling sleepy in day time may be due to lack of sleep in night and less water intake.So for these eat healty food,proper exercise,eat light meal before bed,eat dinner at least 2 hours before sleeping. Stiff at back of head may be due to pillow or keeping your head down for long time. Do some hot water fomentation on back Don't be stressed  you will be fine