RecruitingPhase 2Drug trialScreening Trial for Pain Relief in Schwannomatosis (STARFISH)This is a placebo-controlled, multi-arm phase II platform screening trial designed to test the safety, pain responses, and pharmacodynamic activity of multiple experimental therapies simultaneously in participants with moderate-to-severe pain due to schwannomatosis (SWN). This Master Study is being conducted as a platform that may allow participants with pain associated with schwannomatosis to receive a novel intervention throughout this study. Embedded within the Master Study are individual drug sub-studies: * Investigational Drug Sub-Study A: Siltuximab * Investigation Drug Sub-Study B: Erenumab-Aooe