We're in the same boat.
You 100% need to get that water issue sorted though. If Dh wont ring those guys back get the numbers off his phone and ring them yourself
These are some things we did with our house that were easy, relatively cheap and made a big difference.
Mega buckets of warm white paint. Bedrooms kitchen hall everywhere. Big rollers fuck it on any old way no cutting in to ceilings do the whole lot the same, same shade (diff finish though) on any wardrobes or doors, so joins not obvious.
Lifted horrible old carpets and laid laminate flooring which is actually not that hard. Watch out for 3 for 2 offers in b and Q and similar. Also end of line clearances are perfect for bedrooms.
Changed old orange skirting everywhere for thick white ones. Again, easy with YouTube. And now you have nice clean fresh bedrooms, all it need is some pretty linen and lampshades.
Same again in the kitchen and batheoom.I've heard people using contact vinyl to cover laminate counters to tart them up for a bit. Worth a try. Also big outdoor rugs to cover grotty flooring. Paint over horrible wall tiles. Get caulk to neaten the edges. That is just like using a giant icing gun when you make cakes and gives a lovely clean finish.
Lighting is a big thing, modern and or pretty shades and fixtures. A couple of plants and pictures, clean white walls and inoffensive easy clean flooring will make a big difference. It wont get you into top 100 Gorgeous Mansions, but it will give you breathing space while you get money and workmen lined up for more intricate jobs.
That's one thing, but your most pressing problem is your DH's lack of enthusiasm. Hes tired from work, I get that, but if he works 7to 7 so do you! You need to get him on board - could you get him to row in behind you every Saturday morning say? You get the kids out of the house for 2 hours while he cracks on with something. Then he takes them out, to the park, round his mums, for another 2 hours while you carry on. Thats not a big ask really, achievable and wont burn anyone out. He'll still have plenty of weekend time to chill. And when you see the results it is a great motivator.
Make a list of those kinds of jobs, keep the dimensions of everything in your bag so that if you see cheap offers anywhere you know immediately if they will fit, ask for IKEA vouchers for xmas or birthdays or whatever and most importantly commit to 4 hours on a Saturday morning to get stuck in.
Good luck with your DH.