Gradual fiber increase matters twice on sema - slowed gastric transit exaggerates the bloating response, so what works normally is still too fast. Soluble over insoluble and a 3-4 week ramp is the safer path.
Constipation during a prolonged stressful period plus GLP-1 gastric slowing is a compounding effect - stress independently suppresses GI motility and the medication adds more slowdown on top. The Senna resolution is consistent with what a lot of people find; it's the strongest over-the-counter option for the GLP-1-specific constipation pattern.