The sweating which occurs at night can be from different factors.
The factors are high thyroid
hormone levels, anxiety & tension states, medicines, low blood glucose, chronic infection, tumors, autonomic nerve disorders etc.
One epidermal shot should not have prolonged effect.
Blood sugar should be checked as it is a common cause.
Sometimes heart pain may present as only sweating .
Heart condition which is a matter of concern, should be excluded too as early as possible.
In some cases no cause can be found.
As symptoms are presenting for a week, you should have an examination by your doctor & if necessary do some tests to get the proper diagnosis.
I hope this information will be helpful.
Please ask if you need any clarification.