hi J.;
my exp of using a pump was very poor and very good; the pump worked but it totally goofed up my nursing.
here's what happened. i used, by direction from my LC, a hospital grade Medela Classic which i rented from a surgical supply store; it was an incredible machine and i often got up to 10 ounces out per sitting.
the engorgement skyrocketed in a week and i got into a treacherous cycle where i kept making more and more and more milk; it reminded me of the broom scene in "Fantasia." i couldn't leave the house for more than an hour because my shirt would be soaked.
the LC came back and helped me wean off the pump in about a week, thank heavens. the whole purpose of the pump for me was to have my husband help w night feedings, but the truth was the bottles were also a disaster. my son would spit up half of what he took from every kind we tried. and i ended up getting up at night anyway.
so i ended up at La Leche Leage Intl and that was where i really learned what was going on with nursing. i can not urge you strongly enough to go to a meeting. all you have to do is google La Leche League Intl and click on resources to find a meeting in your area. also the chapter leaders' phone numbers are likely to be on the page. feel free to call them, that's what they are there for.
keep in mind that not everything at LLL works for everyone but they are without question the real authority on breastfeeding. i breastfed my son successfully after the engorgement situation was remedied, without a bottle or any other interference, right through my pregnancy w my daughter, and until he was 3. my daughter is now 19 mos and still nursing. neither of my kids ever had a drop of formula.
if the LC that you consulted is not a board certified LC she may be behind the curve; many are. and sadly, even supportive pediatricians are not knowegeable about nursing even if they insist that they are. i would bet money that the folks you consulted, tho surely well intentioned, may be wrong about your latch; you might need improvement. but at the same time, many people have sore nipples well into the third month of nursing; it's not unusual. just hang in there tho, and keep looking for the right answer. you'll find it. at LLL they will examine your latch and position and help you out.
i applaud you for your commitment to this incredibly important part of the care of your baby.
good luck!
J.