Sports bra recommendations?

I'm sure this is quite random, but I've been trying to take my PCOS seriously since I being diagnosed a few months ago. I'm 20, and the doctors wanted to give me medication to lose weight but I'd rather try to do it without medication first.

I'm around 160lbs at 5'2, and I've been changing my routine so that it fits well. But I literally cannot do any form of cardio with my current sports bra. My boobs are too big and they keep coming out, it rubs on my neck and it's so painful.

It sounds silly, but it makes me want to cry when I exercise.

If you have any recommendations, especially not too expensive since I have no money, that would be much appreciated. I have a relatively small waist compared to my boobs, so that's also a struggle with finding bras.

Thankyou!