I was also advised that I had no right to access of any of her properties ( which I bought).
Interesting legal advice, unless you and she do have separated estates. If you don't have separated estates, half of what is yours is hers and vice versa.
she could make further claims against me for financial support to keep her in the standard she has become accustomed too.
She can, but only if she can demonstrate that you are at fault and that is why the marriage has broken down. If she can't prove fault, she isn't entitled to a penny. However, demonstrating no fault on your part is not easy to do. Your best shot is to be seen to be doing absolutely everything you can to save the marriage. Organising (and always going to, even if she doesn't) marriage counselling is a good starting point. If you don't want to get divorced, you can easily drag the process out for several years and with each step show that you do not want the marriage to end and thus show that you are not at fault.
Her final to me is that I take full responsibility for the children's school and university fees for the period of education at 100%, also I pay 15,000 zlotys per month for house support.
The first of those is pretty reasonable and I'd suggest setting up trusts to pay those (i.e. not agreeing to any settlement in which she takes the cash and then spends it as she sees fit). The second isn't. I'd suggest stating that you're happy to settle all bills and cover reasonable running costs (against invoices) while the two of you try to save your marriage.