Struggling to get pregnant

I have a 6 year old daughter but then I had a miscarriage due to being in a domestic violence relationship but since then I have been trying to get pregnant every months it hurts more and more when I keep getting negative results 5 years I’ve been trying and nothing and doesn’t help that since the miscarriage my periods haven’t been regular at all there all over the place as time goes on instead of it getting Easier it’s getting more and more upsetting what can I do or what do I do.....could anyone help or give any advice