Do you get pain when you do bowling action also...or is the pain limited to only throwing??
Do you get pain while doing any overhead activities?
The line in which you said that you dont feel hand connected with shoulder for like 5 mins ...needs attention.
Shoulder is a complex joint with lesser stability and needs to be throughly evaluated
Get your Xrays of shoulder done
Ultrasonography in shoulder conditions is very helpful in arriving to a accurate diagnosis.
Presently it could be anything between
Bicepetal to supaspinatus muscle tendinitis/
Rotator cuff tear
Faulty mechanics or stabilty of scapula
Subluxation of shoulder joint.
Do you get yourself assessed at the earliest.