Dear Rikp99
It looks like the night you had excruciating pain in your rhomboids, a nerve has got compressed. This is why you experienced radiating pain and numbness in the fingers. Following which, there's motor loss of the Triceps, the triceps gets the nerve supply from lower cervical C7, C8, and T1. This has led to profound weakness in your tricep and, do check your right scapula. It could be winged too. You may get MRI to make the diagnosis specific. However, chiropractic care and extensive rehabilitation would completely solve your problem.