“What is the side effects of regional anesthesia?”

Talk to your surgical team

A couple of excellent resources. Side effects also depend on the type of regional block used for what location of surgery, epidural, spinal, intrascalene, supraclavicular blocks, ankle, femoral nerve, etc.
Questions About Nerve Blocks | Regional Anesthesia | Stanford Medicine

Regional Anesthesia | Michigan Medicine (uofmhealth.org)

Risks and benefits (asra.com)
Best wishes.

Persistent numbness for a few days