Hi S.,
Here's my 2 cents! When you experience several nights in a row and start to feel the effects of sleep deprivation, I know it can be frustrating & you can start to have doubts. My 8 month old has done the same thing & I've occasionally pulled out the tylenol "just in case" he really is in pain so I know how you feel. Just remember, it's a phase! This won't last forever!
Seems like there's 2 ways to go here with all the advice: pick him up, feed him and/or bring him into bed with you OR try to reassure him & let him work through it & soothe himself back to sleep. My husband & I both have trouble sleeping sometimes & we've had to work on our own habits so teaching our children to self soothe & go back to sleep on their own has been really important to us. Also, my husband has accidentally clobbered me in his sleep so having an infant in the bed w/us was really not an option! We pretty much followed the book "Healthy Sleep Habits, Happy Child" (actually, I usually call me sister for the cliff notes because when I need advice the most, I'm to tired to read the book =) We call her the sleep guru- she's got 3 kids with awesome sleep habits & their very secure even though she didn't run & pick them up when they were babies). As a result, our 3 1/2 year old is a great sleeper & everyone comments on what a happy child he is.
Sometimes the night waking can also be because your baby is overtired. You know how people say, "oh he's up late, he should sleep great tonight!" NOT TRUE. Remember this: "Sleep begets sleep" and "it's not logical, it's biological". Ever been up past your normal bedtime, overstimulated & had a hard time going to sleep? Same for babies & at 6 months, he would rather be awake & play with you & see what's going on instead of napping. So I would wonder how is daytime napping is going. That has a huge affect on how he will sleep at night. I think at 6 months, his daytime nap rythm might still maturing. Again, this is biological & it will work out!
Anyway, you have to decide which approach you & your husband are comfortable with. Hope this helps & good luck! -M.