I have had endometriosis for years, and I have stage 4 (the worse that it gets) which of course has been causing a lot of pain. I had a laparoscopy in 1999 but it did not help much with the pain. At that time the GYN told to take Ortho Cyclen on a continous basis (take 1 pill a day for 3 months-skipping the placebo-and then have a period ) so that I would have a period every 3 months instead of every month. I still had severe pain when I had my period, and in my case Naproxeen Sodium 500mg (painkiller is what helped me the most).
However, around fall 2003 the pain got to a point that I could not take it anymore. It was so severe that I had to take codeine and percocet (narcotic painkillers) until I had surgery. So, I got another laparoscopy in december 2003. This time, I had a surgeon who is a laparoscopy specialist and has a lot of experience removing endometriosis. After this laparoscopy some Doctors wanted me to take the Lupron shot. I refused to since I could only take it for a period of time and that does not make sense. It is not a good treatment for endo in my opinion. I went to see another Gyn that has a lot of exoerience with endo patients, and she agreed that Lupron is not a good option for endo. So I started taking the BCP Alesse (again on a continous basis). This has the same formulation as Loette. Alesse is the name used here in the USA, and Loette is the name used in Europe. When I first started taking Alesse (Loette) I had nausea, and acne. These side effects stoped after 3 months. Most docotrs recommned that you take a birth control pill at least for 3 months in order to let your body get adjusted to it. After this period you can decided whether or not it is working for you.
I have been using Alesse for more that a year(since I had my second lap.), and I have been pain free except when I have my priod which is every 3 months. During my period I take naproxeen sodium 500mg or Bextra (made by pfizer and it does not have a generic yet), and they both help.
However, Alesse has made me sooooooooo moody. I have been having mood swings all the time. I could not take this anymore, and went to see my doctor today. She said that I have to be on a pill with a low dosage of estrogen, so my other option would be Lo-Estrin 1/20 Fe(norethindrone acetate/ethinyl estradiol w/ferrous fumarate oral). She gave me a prescription for it and I am going to give it a try for 3 months.
Regarding your question about painful intercourse, I agree with the previous posters about using a lubricant, and a lubricated condom. You may be allergic to latex. Or you may be allergic to the spermicide nonoxynol-9 that some condoms contain. When I use these I get that same burning sensation that you described. In the past I used to just take a painkiller before having intercourse. I hope this helps you somehow, and if you have more questions feel free to ask.