Hello
You are having cough , cold ,
severe dizziness particularly when lie down and turn head on one side .
Even you develop
nausea .
You are also over weight .
All these symptoms may be due to these possibilities , these include:
1 Hyper acidity , as this is one most common cause . Avoid fried , greasy , oily pizza, burger type foods . Also avoid alcohol or drinks with caffeine in them .
2
Hypertension or hypo tension is another most common cause of such symptoms ( particularly when lie down ). Diagnosis can be confirmed by physical examination at the time of these episodes.
3 Allergic
bronchitis , sometimes
allergy causes such type of symptoms due to unknown reason ( idiopathic causes).
Since you didn't mention the duration of these symptoms , so it is very difficult to establish any diagnosis merely on the basis of these symptoms .
However these type of symptoms are due to different disorders , so consult a physician and get his opinion because physical examination is important.
Good luck.