I only had gas and air because I had a homebirth. Up to 4cms I tried paracetamol, moving around on gym ball (better than walking or stamping feet for hips) a couple of juggling balls I squeezed, general distraction like counting out loud length of contraction, or singing along to a song. After 4cms I stayed on ball and squeezed juggling balls + hit them against things, chewed on damp flannels and the balls, panting breaths, then gas and air when midwives arrived, kept squeezing juggling balls all the way to the end.
I got most of those ideas from a book by juju sundin called birth skills about being active in labour as pain relief, and used then when DS was born. I didn't have SPD then but the ideas plus gym ball worked pretty well for this labour.
Gas and Air is good because you can move around with it.
For hospital births I believe epidural is not advised, because it's too easy to open your hips too wide and potentially cause damage.
I didn't have SPD with DD1 either, but I had pethidine in labour with her and basically went to sleep for a few hours, so that's probs not great if you want to avoid lying down.