Tricep pain, from pitching (baseball) no diagnosis!

For 2 weeks i have had tricep pain which hurts from my shoulder down my upper arm to my elbow… at random intervals.

i am sure it is from baseball, i pitch and think i possibly pulled my tricep. i went for an ultrasound to look for a tear but they didn’t find anything. i have rested it for 2 weeks and still have pain.

i dont know what i should do! i’m 16 so i cant completely lie down and rest, i have school and all. but i dont pick up anything heavy and limit activity for my right arm (pitching arm)… should i be icing my arm? wrapping it in a tensor? applying heat? or just keep resting it and not using it until the pain subsides? then slowly go back into baseball?

Thank you!

– Dan