Here are some resources to help you explore if Lidocaine Injections or Mexiletine can be helpful for Abdominal Pain.
Local injection for selective abdominal wall pain patients can produce significant pain relief. The diagnosis of abdominal wall pain is an important component in avoiding unnecessary operations in patients with abdominal pain.
Efficacy of treating abdominal wall pain by local injection – from pubmed.gov
Mexiletine (Mexitil®), an orally taken form of lidocaine, was originally approved to treat irregular heartbeats, but sometimes is effective in the relief of chronic nerve pain. Mexiletine reduces pain by adhering to peripheral nerves and reducing pain signals carried from the peripheral nerves to the central nervous system and brain. Over time, as mexiletine bonds to the peripheral nerves, the feeling of pain is diminished. Mexiletine is being used experimentally to treat pain associated with different kinds of peripheral neuropathy. – From the Center for Peripheral Neuropathy
Be sure to read about the warnings and side effects of Mexiletine from Medline Plus.