You shouldn't have sex the first 6weeks after birth, you body needs to relax and you are at higher chance for infection those first 6weeks. With your breastfeeding problems, don't use any cream unless it says breastfeeding safe on the bottle, that will help with the dryness and pain. (you can find it at any drug store!) The itchieness can be because your starting to get engorged. Expressing or nursing in different positions will help with that. Your nipples may also be sore if you put soap on them. Don't use soap on your nipples, just use wrom water, it sounds weird but their is something in the milk thats cleans them for you...Also after feeding, gently apply expressed milk to your nipples and allow to air dry. Do not wash nipples before nursing. Also using a blow dryer on a low setting for about 15minutes may help. Try to wear a nursing bra that fits properly. Your periods will be all over the place for a long time so don't stress out over it tell you can see your dictor...