Alice hope your gas leek is fixed or the gas turned off at least? Our house is rented so I'd just call the landlord (unless the house was about to blow up, when I guess I'd call the fire brigade!) - although I prefer never to do that as he speaks Bayrish and won't or can't switch to Hoch Deutsch so I only understand about 1 word in 3 even face to face, possibly I'd have top get a neighbour to communicate with him by phone if DH wasn't about to do it 
My kids speak English to each other 90% of the time if we have no non family members here, we have been here 5 years, since DD was a toddler, and the boys were born here, so it sounds like they are quite unusual, but they are young - tbh I hope it doesn't change! They don't have any close English speaking friends but we do sometimes meet up with one family we met through an English toddlers group that has long since folded - the nearly 7 year olds speak English to each other but the 4 year olds switch to German ... My German is still bad enough that the kids instinctively stick to English with me I think, though if they try switching to exclusively German my selective understanding will mean they won't be getting treats and lifts and help with anything I don't actually need to help with unless they ask in English - just basic maintenance til they switch back :o
Not getting a lot of sleep no Ploom although DD is fine, just sneezing a bit and blowing her nose, DS1 has a cough with the sneezing but is also OK and only woke once in the night - luckily I was in his room already (we've just moved the boys in together) as I was sleeping on the mattress on the floor in there with Ds2, who is doing one decent stretch of about 3 hours but up and down the rest of the night.
Yes Freibad is heated - baby pool usually around 30, "fun pool" high 20s and lane swimming and diving pools around 25 - they have the temps up on the way in, but the kids also have shortie wetsuits they wear when the air temp is low 20s or below :o I love swimming but rarely can due to ds2. I used to swim a mile 3 or 4 mornings a week when I was at uni, it is the only sport I have ever found that I really enjoy, though I don't do the strokes properly due to contact lenses and habit I used to have no problem doing 60 lengths of the uni pool in 40 mins or so - slow but steady - which was a mile, I think I could still do it if I ever got the chance, but that it would take me a lot longer now. I love the way you can let your mind drift off when lane swimming alone - when I briefly attempted couch to 5k before conceiving DS2 I was always concentrating on the timings and in too much pain/ strain to do that , but I guess people who can run comfortably get the same from running! I don't find the Freibad water cold but am well insulated :o DD impressed me last time by swimming 50 meters (2 lengths of the lane swimming pool) without stopping, and ds1 is getting the hang of things gradually, one day they'll all swim well enough for me to swim up and down rather than supervise at the Freibad!