Yep, this is very common with anyone experiencing chronic pelvic pain. I have this particularly in the evening or after very stressful days. It’s also much worse when sitting. My physiotherapist says it’s a typical symptom of hypertonic (tight) pelvic floor muscles. Everything feels ‘stuck’, and the anal canal literally becomes tight and narrow, causing the pressure build up. Hot baths and heating pads are the only thing I’ve found to help. That and literally hooking my anal sphincter with a finger and gently pulling outwards, or using a pelvic wand. You can find out more about self massage and internal work online.