Brief Answer:
Anti-inflammatory drug will give you relief
Detailed Answer:
Hi Ms XXXXXXX 
Thanks for your query.
There is nothing to worry about. It is just a 
concussion of the scalp along with a condition called 
cervicalgia, in which there is a stretch or a minor tear in the neck and upper back muscles, due to abrupt/violent jerk or 
whiplash injury.
Cold compresses over the bump, along with a short course of a combination of anti-inflammatory pain killers, such as, ibuprofen + 
paracetamol and, a 
muscle relaxant, such as 
chlorzoxazone or Tramadol.
The bump will disappear within a week's time, while other problems too will revert back to normal very soon. The mild 
depression is just a transient phenomenon and will disappear in a couple of days. It is not of any concern.
Consult your doctor and apprise him of my opinion. I am certain that he will agree  with my opinion;  order required tests, and- based on the reports-  will arrive at a certain diagnosis and  prescribe suitable treatment as advised.
Hope I have addressed to your concerns to your complete satisfaction and you find my response helpful and informative. I will be happy to answer further queries, if any.
Fond regards and have a nice day,
Dr. Rakesh Karanwal