Manmohini,
You sound EXACTLY like me about 3 months ago - when I was trying to figure out this whole nursing thing . . .
That tingling sensation you are feeling is milk let-down. That's when your milk literally lets down in order to feed your baby. You are lucky that your baby gives you 2-3 hours at a time to rest. My baby wanted to feed every 1-2 hours. She gave me a break at night, but that's when I got engorged (like you).
Here's my advice: Keep feeding on cue like you are doing. Yes, alternate the starting breast each time. Feed your little one as long as he wants on the first breast, burp and then offer the second breast. He may/may not take it, but it's normal either way. Then next time, start with the other breast.
At night, when you feel really full, take out your pump and pump off just enough to make yourself feel comfortable again. If you pump too much, your body starts to think that your baby needs that much, and it keeps making a lot. Unfortunately, you may have to do this a few times at night until your body regulates itself (and it will - but it takes a good 12 WEEKS!!) At about the 3 month mark, your body's hormones start to stablize, and so will your milk supply. It's such a relief when your body regulates!!!
For breast infection (which I also was soooo lucky to experience), the biggest thing is to keep your milk flowing - meaning, don't try to "skip" a feeding. Keep feeding on demand. Unfortunately, if you're going to get mastitis (breast infection - which I got), you're going to get it because of the bacteria that is naturally found on everything (you, your baby, your clothes, etc.). The biggest thing is to keep your stress level down, get rest and eat well. Really take care of yourself so if that bacteria DOES get in your nipple, your body is better able to fight it off.
Whew! I would agree that kellymom.com was a GREAT sight for me to get advice about nursing.
If you have any questions, feel free to ask or e-mail. I have learned SOOOOO much about nursing in my first four months of it. It gets sooooo good once you hit the 3 month mark!!! Keep up the great work!
Chrissy