Kidney Stone post lithotripsy after 2 months.

Hi, I started having stone problems about 2 years ago, first one was 13mm in my left kidney and they did litho and stent. At the same time I had a smaller one in my right. After several months they did litho on that one with no stent it was only 5 mm. In all now I have had 5 lithos and 2 stents. Don't want anymore stents. I had a 24 hour urine test done and blood work and doctor said it showed nothing. Just need to drink more water. The stones are calium oxalate. Which I hear is normal. But since my last litho 2 months or so ago I still have a uncomfortable feeling in my Flank area. I wondering if too many lithos can cause kidney problems? I so tired of this. Even with insurance it still cost alot of money, and the calcium oxalate diet seems so difficult to follow. I also found out I have copd so I just feel like I'm falling apart. I'm an ex- construction painter and I can't do it anymore. Can anyone offer advice on what i Can do.