Thanks for using the forum. I am happy to address your questions, and my answer will be based on the information you provided here. Please make sure you recognize that this forum is for educational purposes only, and it does not substitute for a formal office visit with your doctor.
Without the ability to examine you and obtain a history, I can not tell you what the exact cause of your symptoms is. However I will try to provide you with some useful information.
The distribution of your symptoms is along the area of the median nerve: this nerve supplies most of the sensation and some of the strength to the first three digits. This is the nerve commonly injured in, for example, carpel tunnel. The nerve may have been injured during your surgery. To best determine that, a study called an EMG/NCS, which tests how nerves conduct electricity and how muscles respond, would be helpful. This would tell if there was nerve injury, what type it was, and the severity of it. If you have a lot of pain in that area after surgery, one concern would be that you have complex regional pain syndrome, which is a pain syndrome that occurs with nerve damage.
You would benefit from evaluation by a neurologist, and specifically a neuromuscular specialist (a neurologist specialized in disorders of peripheral nerves and muscles). If nerve injury is confirmed, surgery may be an option, but alternatives like physical and occupational therapy may be all that is needed, and medications to treat the nerve pain (such as neurontin or lyrica) may be helpful.
Thank you for this opportunity to answer your questions, I hope you find the information I have provided useful, good luck.