Hello and welcome to HCM,
You are facing problems pertaining to different organs / tissues.
The hissing sounds in the ear is called tinnitus.
Tinnitus is a symptom of disease process of the
inner ear.
Is it associated with feeling of fullness and/or vertigo?
If yes, it may be Meneire's disease.
You need to consult an
ENT specialist for examination of the inner ear and hearing tests also.
Feeling of
electric shock in the jaw suggests nerve involvement.
Involvement of nerves due to infection, inflammation can lead to
tingling sensation or electric shock like feeling.
Altered olfactory sensation (smelling cigarette smoke) suggests involvement of
olfactory nerve (nerve supplying the nasal mucosa).
Olfactory tests need to be done to test the olfactory function.
Consult your ENT specialist at the earliest.
All these symptoms could be manifestation of one disease process.
Thanks and take care
Dr Shailja P Wahal