Pain in arm with big bruise. Should do?

28 years old male, about 4 days ago, I did one punching bag shot and right after it i felt a huge pain in my elbow and i couldn't move my arm from the my elbow, it was like it's locking somewhere or something is blocking the movement of my arm back and forth. 2 days later a big bruise started to expand from my elbow going upwards and downwards on my arm reaching half of my biceps and a little on my forearm. today is day 5 after the incident, the bruise is getting purple and blue and on my biceps is turning yellow, what do you think i should do?, i put some ice packs on it but still i'm feeling some pain when i touch the nerve passing from the inside of my arm( dont know what it's called), your advice would be highly important because i'm worried about it and i want to get back to my daily workout. thank you... Lewis.