I'm not in exactly the same position as I'm working full time, but feeling a bit similar to everyone else here.
I finished my degree and took a job as a support worker, but got pregnant and had almost a year out maternity leave. When I returned, I realised that due to the cost of childcare (and the fact my OH isn't making tons of money in his job) my only option was to stay in my role (which offers flexible hours) until my DC is 3 and gets funded hours, or end up in shed loads of debt trying to make ends meet with an entry level 9-5 job somewhere with prospects. Where I work, there is no development pathway for support workers, so it's a dead end. So even for me - who is in work and is desperate to progress away from my current role - it's a challenge.
The roles I'm looking at won't even consider me, given that in most employers eyes outside H&S, I just drink tea with people for a living and take them shopping (which it definitely isn't). I really want to use my brain and I know I have much more to offer. All I did was have a child and I feel a bit punished for it!
Just wanted to point out that quite a lot of mums not only struggle to get on in their career if they have had a break, quite a few are forced to take jobs below what they are capable of due to the cost of childcare or lack of flexibility in more skilled roles. I now have the problem of having to explain to employers why I have stayed in this role longer than it is expected, as it would not be usual in the career I want to pursue (which is very different to H&S). I guess we all make that sacrifice, but employers need to stop making assumptions about mum's returning to work. I think some people think in a family there should be one breadwinner who is high earning, and the other does something at a lower level. In some cases both parents are starting out in their careers, or both are high earning, so one has to make a sacrifice, even if both want to do well in their careers.
It sounds like the OP has encountered some very rude people in her job search. I would say to that - lucky escape!
I am taking short online courses at the moment online. Some can be as little as £15 and may not be a professional qualification, but demonstrates an interest in the area you wish to move in to at least. Might be worth doing that along with some work experience?