The symptoms as mentioned in your post can be attributed to either a fluctuation of blood glucose
level (due to sugar and carbohydrate
withdrawal) or Neuropathy (damage to the nerves).
Given that you smoke close to a pack of cigarettes a day, it can act as risk factors for the same.
An estimation of the blood glucose level & nerve conduction studies will be helpful in clinching the diagnosis.
Symptomatic relief can be obtained by intake of nervigenic agents (like Vitamin B6, Vitamin B 12, Folic acid
) as well as multivitamin
& multimineral supplements including iron, calcium & Vitamin D needs to be added in diet to help in blood formation & nerve conduction.
Also get a diet chart prepared from a Dietician, according to the need of your body.
There is no need to worry, you will be fine.
Till then, maintain adequate hydration & proper nutrition status, exercise regularly and avoid stress.
Wishing you a Good Health.