How much water are you drinking throughout the day? That's the one thing I noticed people often overlook at this stage. When I was dealing with my own recovery situation, staying properly hydrated made a noticeable difference in how my body was healing overall. The numbing spray and sitz baths everyone mentions are solid foundational stuff, but they're treating the symptom. What actually accelerated things for me was making sure my body had what it needed to repair tissue - and dehydration works against that.
Beyond hydration, two things made a concrete difference. First, pelvic floor physical therapy. I know that sounds like another thing to add to your plate when you're exhausted, but even just one or two sessions can show you what's actually tight versus what's genuinely painful from the tear itself. A lot of tension compounds the healing process. Second, the position thing others mentioned is real - I found that sitting reclined on a couch with pillows supporting me sideways was way better than any donut cushion for me personally. Everyone's anatomy is different, so you might need to experiment, but the idea is taking pressure completely off the perineal area when you're resting.
At three weeks you're genuinely still in the acute phase. The pain does start noticeably improving around week five or six for most people, so you're not stuck like this. Just keep the area clean and dry between sitz baths, and if you hit week five and things aren't improving, that's when you loop your doctor back in. You're doing the right things already.