Have you thought of trying a menstral cup like "diva cup"? I love it! Walmart or a drug store would have it. I used to get instant cramps when I used tampons, so I switched to the cup! Love it! Less messy, no smell! You dump it when full and rinse clean and reuse. You just have to look at the directions for putting it in correctly. After a few cycles you should get the hang of how to put it in.
It's a clear cup that's bendable like rubber or silicone that you insert inside like a tampon. Pull out when full and pour into toilet. Clean in sink with mild soap and warm water, then reinsert
You don't even feel it if you do it right
Not sure what kind of tampons you have tried, but When you insert a dry cardboard applicator tampon into a not lubricant place it will not feel nice or work well. With the cup, you wash it before you insert it and it goes in a lot easier.