Im on my own with 4 wonderful children, and i never have any problems coping on my own, but my youngest dd2 is 7months and has kindly slept through the night for me about 4 times, mostly she just wakes around 2am and then again at 5am (ish) and then she wakes for the day at around 7/7.30am - this is ok, id like for her to go longer, but i can cope with this, BUT the last 3 nights she has gone to bed as usual at 7pm, usual routine nothing has changed, and she has woke around an hour later and yelled her head off, i feed, wind, cuddle etc, she settles, 10 maybe 20 mins later she starts again, burps, wriggles, squeels, breaks wind, slowly calms down, 10/20 mins later she starts again etc etc. ALL night non stop! Im absolutley shattered, ive tried everything, all the usual 'tricks' ive dosed her up with gripe water, calpol etc in case its a teething thing - not working 
im becoming a frazzled, grumpy wreck, HELP!! (if you can) xx