Hugs to you.. this must be a difficult time.

When i weaned Aiden, admittadly, i had mastitis already, and was on antibodics, which made it abit easier.

Express for comfort, i just did abit maybe, 20ml every so often, or in the shower. I did a quick goggle - the herb sage is mentioned alot, a couple of cups a day. Some also mention to avoid nipple stimulation completly, so, avoiding expressing, but, i think you also need to avoid mastitis abit as well. Using ice packs or frozen veges to relieve swelling, and also to reduce milk supply. Dont use heat packs, as it can create a let down effect.
Keep up your fluid intake.
Also, taking antiinflamatries like ibuprofen will help.