Dear,
It may be due to bursitis
First of all Get your X-Ray done a soon as possible
Apply Cold Pack Twice A day
Next Steps
See any good Ortho Doctor and get your assessment done. and then visit a good physiotherapy centre nearby you
Health Tips
Avoid lifting heavy objects from painful hand, Do not keep hard pillows under your neck and avoid sleeping on painful side and avoid doing exercises with that hand for couple of days