I have gone through your question, Without physical diagnosis and medical history it would be suitable to draw any conclusions.
In your case of stiff shoulder it could be adhesive capsulitis
. Adhesive capsulitis is a common problem (especially in the case of women ) and is completely curable with just simple exercises like moving your arm in to various positions and also yoga
.Adhesive capsulitis is a problem where the area around the shoulder joint swells or gets numb but later it becomes normal , the reasons for this could be overuse or being in a fixed postions for a long period etc.
I would suggest you to visit your nearest general physician for further medication.
If you face any problem ahead please feel free to email me ,
Wishing you to get well soon,