In my opinion every diagnostic test will give you some disgnosis every time.
Every time you need not to worry about diagnosis done.
Just do cold packs and have some light painkillers.
But make routine of some exercises every day.
I m sure you will get cured in 15 days
Next Steps
Ice packs for 15 min for five times a day.
And follow exercises given in link below:
https://youtu.be/bEDH_uTcdf4
https://youtu.be/hzv6NvPW33Q
Health Tips
Avoid lying down on sofas
Avoid lying down on sofas seing tv
Reading on sofas
Light massage over painful area for 15 days regular.