I *so* hear you.
I think it's very imp. to have a SAHP, but, right now, I'm just worn out dealing with a small child all the time. I'm actually starting to consider a part-time job...but, the problem is, *everything* I've ever done is with...well, kids...I'm a certified elem. teacher, and worked as a teacher (obviously), nanny, tutor, camp counselor, etc.
I don't *want* to work with other kids right now. I want a freakin' break. The only non-kid related jobs I've ever had were as a library clerk and a laundress...
Unfortunately, our timing sucks...we move this spring/summer (to exact parts unknown), DD is having surgery May 13 (which, depending when/where we move, may mean driving here, staying over a few days, etc), and DH will be gone from mid-March to mid-April, and again in May (while DD has her surgery...it can't be helped). But, if I'm still feeling this way next fall, oh yeah...I'll be looking for something to do...maybe even volunteering if it won't kill our finances to have a baby-sitter w/DD at that time.
You're not alone. You're *so* not alone.
And, seriously, I'd get rid of the neighbor kids somehow...maybe just tell them, "I'm sorry, but right now is family time. You're welcome to come back tomorrow after 3 (or whatever)"