Hello & welcome! If you have any questions after reading my answer, be sure to let me know.
For mild pains you can try over the counter medicines like GAVISCON & PEPTO-BISMOL
These may help relieve the pain,
However if you have consumed a lot of prickly pear spines or are having a lot of pain, then you need to go to the ER for evaluation and treatment,
The over the counter medicines can be purchased from your local pharmacy,
Dr Gupta, MD
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Please get back for any clarifications,
Well, the server wouldn't let me answer last night. An answer read online said to asap eat some spongy food like cottage cheese, fiber bread, pasta, mashed potatoes to try to coat the cactus spines. To also take some meticucil to hope that it will make a cocoon around it and help protect the GI tract...or if severe to go to the ER. Thanks!