Hey ezz! Congratulations on your new little one!
I also developed a haemorrhoid after Emily was born, and yes it HURT! Is yours internal or external?
A pad soaked in chilled witch hazel will help reduce the swelling and pain. Also, there is a newer product called proctofoam which is kind of expensive, but works wonders, I found. (I think you might need a prescription for that one - talk to your md/midwife.) And apparently if you make a paste of epsom salts with water, and apply it to the spot, it will really help bring the swelling down. Haven't tried that one myself, but it's worth a shot, I'd guess.
Mine resolved in a matter of days after the proctofoam. My midwife said that generally women who complain of them at 1 week, find that they are improved at 2 weeks, and most are completely better by the 6 week appointment.
The best thing you can do is keep from becoming constipated - lots of fibre, fruit, and raw veggies, and plenty of water. Avoid straining on the toilet. Get a little LIGHT exercise. (Don't over do it at 2 weeks PP.) Also, if you are taking any pain medication, make sure it has no narcotics in it, because they will also slow your bowels down. Kegels (pelvic floor exercises) are also supposed help increase blood flow to the area, and thus promote healing.
Hope you are feeling much better soon. All the best!