This is boring but important. Start it now.
Make a diary logging your symptoms, doctors appointments, medication taken, pain, mood - everything. If you can't do something because of the pain, put it in the diary.
Make a record of every penny spent on travelling to the doctors, advisors, prescriptions, medications, phone calls - everything you spend as a result of this accident
If you are taking time off work - record this too. Any loss of income and so on.
Keep receipts of everything.
So now you have your detailed records. It will help you to have a timeline as well - a brief record of important dates - date of accident, doctors appointment, other appointments, medication started, medication finished. Just very brief notes, in date order.
You don't need to go to the hospital unless the GP recommends it.
All this record keeping is a boring grind, but it will save you a lot of hassle in the long run. You can do it all on your pc, and have a safe place for your receipts. If necessary, staple the receipt to a piece of paper with details of the expenditure - date, amount and what for.