Notgivingup17, I had not heard about thermography for detection of pain, but know about the FDA warnings with respect to breast cancer detection.
"There is no valid scientific data to demonstrate that thermography devices, when used on their own or with another diagnostic test, are an effective screening tool for any medical condition including the early detection of breast cancer or other diseases and health conditions." Read more here:
- FDA Warns Thermography Should Not Be Used in Place of Mammography to Detect, Diagnose, or Screen for Breast Cancer: FDA Safety Communication https://www.fda.gov/medical-devices/safety-communications/fda-warns-thermography-should-not-be-used-place-mammography-detect-diagnose-or-screen-breast-cancer

So, I looked for articles about thermography and pain detection and found this:
"Thermography has found to be effective in assessing and tracking pain related problems having associated vascular changes. It has also proven to be particularly effective in detecting and tracking changes in burning phantom limb pain and reflex sympathetic dystrophy and is illustrated in the following sections."
- Thermography in Pain Management https://www.practicalpainmanagement.com/resources/diagnostic-tests/thermography-pain-management
- Thermal camera as a pain monitor https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5734233/

You might want to discuss the effectiveness of thermography with your doctor. Let us know what you find out.