I had no family support and my 2 DS's father was abusive so hasn't seen them at all since they were 3 and 4 (his choice, the court order was to keep away from me not them) and barely saw them since birth anyway, his family weren't interested because they either didn't have kids or theirs were older and he was the black sheep of many siblings. My mum had a new partner and lived 100 miles away, my dad deceased.
I had no support, was full time self-employed and then took on a full time job as well as being self-employed. DS's both went to nursery from 3 months old full time so I could keep my career going (expressing was a challenge, but I breastfed both for 5 months as well), I took on debts for a few years which I'm now climbing out of, but it's all been worth it.
They are both teenagers now, I'm in my 50's but I have a very close bond with them, we did everything together when they were younger - when they were awake we were doing something (walking the dogs, going to the park, doing art, reading, playing in the garden, going to the beach - hardly ever had the TV on, kids were always content) when they were at nursery or asleep I worked - it's been an almighty hard slog for 14 years and on my own for most of it, but so so worth it to see them now, both level headed, extremely bright and (so far) very loving, polite, helpful and supportive of my decision to work hard whilst bringing them up on my own - hopefully this will continue throughout their teens.......fingers crossed!! Absolutely no time for myself, but I feel that coming now they are 13 and 14.
My lifeline was having a superb nursery and primary school, so supportive and caring, close to where I worked, they helped to gave them the confidence and social skills which shine in them now, something I couldn't have done alone. My employers have also been super supportive if I've had to take time off with them being poorly, but thankfully with going to nursery full time they tend to catch everything there and build a good immunity to bugs, so haven't been ill much at all - I consider myself very lucky, but have also put in a lot of very rewarding hard work and I believe that's what it takes from parents no matter how many parents/grandparents are involved in bringing up children.
My advise is to concentrate all your efforts on your children, do without for a few years and reap the rewards when they get older - when you can regain your life, satisfied you've done the very best for your kids 🙂. Your husband might look to have it easy but he is bringing home the bread and butter and sounds like he's doing an important job. I don't know your situation, but on the face of it you seem to have it a lot easier than I did and at least they'll grow up with a dad. Good luck.