Shoulder, posible Biceps Tendon problem. Need advice.

I play college tennis and I’ve had a problem with my shoulder for the past 4 months. After serving like a madman without warming up it started hurting. After about two weeks it kept getting worse and i couldnt take the pain anymore. I stoped serving for two months and tried again and it came back. It’s a very sharp pain in the front part of my shoulder. I dont believe it’s the muscle but under the muscle. Someone said it might be bicept tendon something or other. What do you posibly think it is. and What would be best to help this. Any imput would be great.
Thanks much
Jeremy