I had a 4th degree tear with dd2 so I got to try a lot of different healing options!
For swelling, bruising, tearing, or random physical "trauma" try homeopathic arnica (in pill form). You can start taking it immediately after the birth and keep going as long as necessary. Dosage info is on the bottle, but if you have major birth trauma (big tear, c/s, etc) you can take more initially.
You can also apply honey infused with comfrey (buy the comfrey herb or oil at a health food store and add it to the honey) straight onto the ouchie tissue... it's good for healing. Pure Aloe Gel can also be applied to swollen/torn tissue for soothing and healing. The honey blend is obviously sticky/messy and the aloe isn't much better... I usually did a sitz bath, then applied the honey or aloe, let my bum air dry while I took a 5-10 minute break, and then got into the shower to clean everything off. However I do know some people who have just smeared on the honey or aloe and then put on a pad and gone about their day.
Let's see... the sitz baths I used were either plain water (as warm as possible), epsom salt dissolved in the water, or comfrey or ginger made up like a tea and then poured into the sitz bath. Did you have an actual sitz bath to use? I found the toilet topper style pretty comfortable since there wasn't any pressure on the perineal tissue.
In general, stay hydrated, don't strain on the toilet (use a stool softener if necessary), try to rest as much as possible, get some sun or air on the sore tissue each day if possible, try the honey and comfrey (external) or arnica (internal). Make sure your diet has enough protein (necessary to rebuild the tissues) and that you're eating enough calories to support the repair as well as the general post-partum needs (like breastfeeding). Use ice packs or warming pads as necessary (I was told cold in the first 12 hours, then heat for the next 12, then whatever felt best), sitz baths, and peri-bottles filled with water or an herbal blend (like comfrey or epsom salt or ginger) while toileting.
Hope you have a wonderful birth and a quick recovery!