Hello,
Welcome at Doctorspring.
I have read your question with diligence.
It looks from your details that most probably you are having minor sprain of triceps or this may be tendinitis due to chronic friction over the tendon due to bony prominence of olecranon or tip of elbow bone.
I will advice you to avoid heavy exercises.you may take a good anti inflammatory analgesic like Ibuprofen (OTC) for relief.Do ice fomentation followed by warm fomentation with warm water pack.

This should resolve in a day or two. If not, please get back to me. I will keep this consult open.

Hope this will help you.
Feel free to ask followups / clarifications.
With best wishes.